Top 10 Interesting Glitches in Pokemon Red/Blue 

Cheating and hacking in Pokemon Red was what got me into the IT field today and why I work in cybersecurity. The thrill of that kinda catapulted my passion and motivation towards the future as tech matured and grew. The only one I specifically remember is the MissingNo going up and down the shore line glitch / item duplication. I remember a friend taught me on the bus ride to summer camp during one summer when I was like 9yrs old lol. Loved the vid, some of the glitches were eh, but yea the top ones were awesome.

Inputting cheats are fun but these natural glitches in game are interesting

"BEATING OFF WITH NUMBER 10"

Love how this game seems held together by glue and straw yet it remains one of the most influential games ever made!

I came from the Future to say that I think Jrose1's favorite Red and Blue glitch is now the Badge Boost glitch

How the Brock Through Walls glitch works, is that when you talk to that trainer, the game searches for your coordinates to see what path you have to take. But as you're not supposed to be able to talk to him from the right, your coordinates won't be where the game was expecting the coordinates to be, so it will just keep looking. Normally, it keeps looking forever which is why it soft locks. But if you have moves with the right PP, the PP values will actually be the coordinates the game is looking for, so the data after that will be interpreted as a path you're supposed to follow. But its a glitched path that happens to let you walk through walls.

5:25 An easy way to explain and understand this is by a mechanical odometer. If you roll back from 000000, you get to 999999, because there are no negative numbers on the odometer. It's the same with XP. XP is supposed to be a positive number only. When the formula gives out a negative number, the game interprets it as a very large positive number.

Someone watching In 2020 where badge boost glitch is the big thing

There is a glitch in which you don't have to set something up. Basically, if you go to any gym and try to fish or surf on the statues inside of any gym. It will just let you do that for no reason at all.

I was waiting for you to mention the Mew glitch, and ofc it comes last lol. I was actually so lucky because I thought I had beaten every trainer but it turned out the one trainer I needed to fight in order to capture Mew was still uncontested. My excitement when I went and actually fought the trainer, then followed the steps exactly to where i needed to go to start fighting Mew, and the battle screen started.... Oh my god that feeling was so good.

to anyone wondering about Trainer Fly, here's a chart that says the values you'll need. List of Pokemon Special Numbers Pokemon / No. Rhydon 1 Kangaskhan 2 Nidoran{male} 3 Clefairy 4 Spearow 5 Voltorb 6 Nidoking 7 Slowbro 8 Ivysaur 9 Exeggutor 10 Lickitung 11 Exeggcute 12 Grimer 13 Gengar 14 Nidoran{female} 15 Nidoqueen 16 Cubone 17 Rhyhorn 18 Lapras 19 Arcanine 20 Mew 21 Gyarados 22 Shellder 23 Tentacool 24 Gastly 25 Scyther 26 Staryu 27 Blastoise 28 Pinsir 29 Tangela 30 Growlithe 33 Onix 34 Fearow 35 Pidgey 36 Slowpoke 37 Kadabra 38 Graveler 39 Chansey 40 Machoke 41 Mr. Mime 42 Hitmonlee 43 Hitmonchan 44 Arbok 45 Parasect 46 Psyduck 47 Drowzee 48 Golem 49 Missingno. 50 Magmar 51 Missingno. 52 Electabuzz 53 Magneton 54 Koffing 55 Missingno. 56 Mankey 57 Seel 58 Diglett 59 Tauros 60 Farfetch'd 64 Venonat 65 Dragonite 66 Doduo 70 Poliwag 71 Jynx 72 Moltres 73 Articuno 74 Zapdos 75 Ditto 76 Meowth 77 Krabby 78 Vulpix 82 Ninetales 83 Pikachu 84 Raichu 85 Dratini 88 Dragonair 89 Kabuto 90 Kabutops 91 Horsea 92 Seadra 93 Sandshrew 96 Sandslash 97 Omanyte 98 Omastar 99 Jigglypuff 100 Wigglytuff 101 Eevee 102 Flareon 103 Jolteon 104 Vaporeon 105 Machop 106 Zubat 107 Ekans 108 Paras 109 Poliwhirl 110 Poliwrath 111 Weedle 112 Kakuna 113 Beedrill 114 Dodrio 116 Primeape 117 Dugtrio 118 Venomoth 119 Dewgong 120 Caterpie 123 Metapod 124 Butterfree 125 Machamp 126 Golduck 128 Hypno 129 Golbat 130 Mewtwo 131 Snorlax 132 Magikarp 133 Muk 136 Kingler 138 Cloyster 139 Electrode 141 Clefable 142 Weezing 143 Persian 144 Marowak 145 Haunter 147 Abra 148 Alakazam 149 Pidgeotto 150 Pidgeot 151 Starmie 152 Bulbasaur 153 Venusaur 154 Tentacruel 155 Goldeen 157 Seaking 158 Ponyta 163 Rapidash 164 Rattata 165 Raticate 166 Nidorino 167 Nidorina 168 Geodude 169 Porygon 170 Aerodactyl 171 Charmander 176 Squirtle 177 Charmeleon 178 Wartortle 179 Charizard 180 Oddish 185 Gloom 186 Vileplume 187 Bellsprout 188 Weepinbell 189 Victreebel 190 Hope i helped.

I actually use the invisible PC at the Celadon City hotel all the time. I never liked the Poké Center music, but I love the Celadon City music, so I use the hotel PC so I can listen to the music I like.

*Mis* - *SING* - *no* Glitch.

There are alot of really powerful glitches like the basic item dupe glitch and Data mod glitches like item underflow and ACE with things like super glitch and 8F, but the most interesting Imo is Pokemon merging. I guess you could do it with 8F, but back in the day it was always so fun to make hybrids of my favourite mons, especially if one of them was a glitch mon with a cool color pallet/ beast stats.

This was a really good vid. Refreshing to see some glitches I haven't seen before, in addition to in depth explanations on glitches I've already been using. Keep up the good work.

Wow! I always hate hearing about the exact same glitches over and over whenever I want to learn something new, and I was hoping that you wouldn't have the Missingno glitch here, but even though you did, I was stunned to know about those other glitches, and even how they worked, and it was really enjoyable to watch:) thank you for uploading this video😊

I remember the invisible PC thing being highlighted in an issue of Nintendo Power, but when Nintendo was asked about the Missingno glitch it was vehemently denied lol

The reason why the SS Anne's still there is because it's a fundamental part of the Vermilion Dock map, and they likely didn't include a version without the ship (because it'd be pointless and take up valuable memory). As a result, should you manage to re-enter the map despite the invisible flag wall, the boat will always be there. Also, my favourite glitch? Transform + Mirror Move - should you use Mirror Move while Transformed, you'll be stuck with a blank move that DOES have PP, but cannot be depleted, thereby preventing Ditto (or Mew) from using Struggle. There's also no way to fix it, apart from Transforming into a Mirror Move Pokémon and hoping Mirror Move occupies the exact same glitched slot, then using all of its PP.

Fav for me would be battle with Professor Oak and his lvl 70 team with fossil Aerodactyl on his team

The experience one is because negative numbers in binary are encoded using the Two's Complement. Basically, you use the left-most bit as the pos/neg sign and then the rest of the bits represent the number. For example, when dealing with signed numbers, (signed) 010 = +2 110 = -2 (unsigned) 010 = 2 110 = 6 However, since the developers never intended for there to be negative experience, the binary representing the experience gained from a battle is likely read by the game as an unsigned number and since the left-most bit is 1, that makes the unsigned equivalent a really large integer.

The reason the experience/item underflow works that way is because the game uses some sort of circular indexing system like a circular queue that when it reaches the very end it wraps back to the first, so in theory if you want over the max amount of xp or items it could drop you back to one, that's why the xp is so high, so that normally a trainer could never get that much xp. So therefore if you go backwards in the queue it's going to bring you to the end of it.

The exp glitch was the reason why pokémon were always born at level 5 up until Gen IV, since the glitch was seemingly brought over to Gold, Silver and Crystal given the re-used code, and Game Freak allegedly couldn't test if the same glitch would repeat in Gen III games despite being built upon entirely new code, so they just "skipped" a generation to implement the change.

Me: Mew is so special. He: Mew is my HM Slave. 😂

wow. as someone who had for sure seen them all, I never even heard of item underflow! all the others I've seen countless times but that one was new to me. Nice video! It's crazy that theres so many glitches you couldn't even list them all (i.e. save corruption to beat the game in 1 minute)

Excellent, informative well constructed video! I didn't know about most of these!

I accidetnally got some of the glitches and I thought they were intentional... I was so sad I couldn't catch a level 150 machop the next playthrough

AMAZING video, you awnsered questions I've always had, got me past the (terrible) safari zone, and earned a like and subscribe!

One of the best Gen. 1 Glitch videos I've ever seen- kudos!

I wish you made more top tens! I love the quality of your vids! More vids to be honest! This is an underrated pokeyoutuber! Please keep it up!!!

The Mew one is the best one cuz you can get it early and as soon as it gets up to about level 20 it's super strong it learns mega Punch and then literally almost knocks anything out!

The Missingno. Glitch may have been fixed in Yellow, but you can still use the ditto glitch to encounter it, they show up as skeleton versions of Kabutops and Aerodactyl and still serve the same purpose.

To me the most entertaining glitch in gen1 is how you can learn clone a pokemon to another pokemon. E.G you can have a pikachu with lapras stats and movepool. Once you learn surf and you proceed to surf with pikatchu, instead of the common seal thing you are surfing, it will be pikachu on a surf board!

That glitch to catch pokemon from the safari zone also works on the southern Fuchsia coast. Missingno will pop up there as well.

I knew about all these... but only because of you. Thanks for the great content mate I subscribed

These are really cool, thanks for sharing!

Here's a bit more of an in-depth explanation of integer underflow: Gen 1 pokemon games store experience values as *unsigned integers*. In my example, I'm going to simplify it by assuming that we're working with 4 bits. A 4 bit unsigned integer can store 16 different values(base 2^4 digits), from 0 to 15, which is equal to the numbers 0000 to 1111 in binary/base 2. If we were working with *signed integers*, it would be from -7 to 7, using the 8 bit to instead mark whether the number is positive or negative. In the case of tracking experience, negative numbers are unnecessary, so an unsigned integer is used. So, what happens if we try to create a negative number when working with an unsigned integer? Obviously we won't get one because it's impossible, so what happens instead? The numbers simply loop back around, hence "underflow" or "overflow" if going the other way. 0000 -0001 =1111 In this example, I simply subtracted 1 from 0. Instead of getting -1, we get 15. You might be looking at the equation and wondering why this works. The simple answer is that to the computer, 0000 to 1111 are the only values that exist for this number. Taking variable names from C's limits.h, let's call 0 UINT_MIN and 15 UINT_MAX. UINT_MIN-1 is equal to UINT_MAX, as shown above. The reverse is also true, as UINT_MAX+1 will resolve to UINT_MIN, which is why adding 1 to an 8-bit unsigned integer equal to 255 (11111111) will give you 0 instead of 256. Some processors clamp values and prevent over/underflow by simply making adding anything to UINT_MAX resolve to UINT_MAX. A perfect example of an unsigned 8-bit integer overflow is Styder7x's "Cracking a Frozen Lake 258 Times is Perfectly Acceptable". Signed integers are usually handled differently. Their behavior when doing calculations that would exceed INT_MAX or go below INT_MIN are very dependent on the language in use. Ada raises a Constraint_Error, Java will have normal overflow behavior going from INT_MAX to INT_MIN, and Python 2 converts the number to a long. I hope that helped some people who may have been a little confused about how experience/integer underflow works! This isn't anywhere near an exhaustive explanation since over/underflow is a result of many properties of computing and involves a lot of different environmental conditions; I'm just trying to clarify why it happens. Feel free to ask questions or point out anything I missed.

2 of these I haven't ever heard of before. Brick through walls (#3), and item underflow (#2). Honorable mention I did hear about the safari glitch before but completely forgot about it (currently playing through red for several reasons for pokemon sword and red is fun also.) So that is gonna make safari pokemon easier to catch XD

It's kinda wholesome that at this point in his Pokemon RU-vid Career, he doesn't know the BADGE BOOST GLITCH, cause otherwise I'd see him throw it in the top 5

Great video! Yeah, the glitches in Pokemon Red and Blue were and still are, interesting!

i've was familiar with the cinnabar island glitch, dragging pokes from the safari zone to catch most of them, but i didn't knew you could catch them all with the trainer fly... I've managed to catch gengar, lapras & machoke but at young age i wasn't that much patient

Take a drink every time this guy says “basically”

Great video man!

Back in the day when R/B were new the Old Man/ Safari zone/ Missingno / Item dupe glitches were common knowledge and often used. That's why they were patched in yellow. The other glitches came later afaik. I was even part of a group who was brute force testing every possible name to see if it was possible to get Mew on cinnibar. We eventually concluded that it wasn't. Trainer fly glitch came later and handed out mews like candy. I don't know how much later, but I played R / B at release and only heard of trainer fly a few years ago

I'm obsessed with your voice and channel!!

I always used the "missingno glitch" to capture a kangaskhan that can learn fly. If you encounter the glitch pokemon that is just "m," you can catch it. You have to have an empty space on your team or the game will crash when you try to withdraw it. It will have the moves water gun x2 and sky attack. You can teach it to fly. After teaching it to fly, give it a rare candy, and watch it evolve into kangaskhan. After evolving it, you can then teach it surf, strength, and cut to be your HM slave. I always try to get the level 0 version of the "m" pokemon, so that way my Kangaskhan will be level 1. Hope this helps.

the glitched Magikarp run was awesome. I'm totally trying it now.

I like teaching MissingNo. Fly, evolving him into a Kangaskhan and then uploading him to Pokemon Stadium on N64.

my favorite red and blue glitch is the 8F glitch, as it literally allows you to execute arbitrary code which i think is pretty cool

Ohh! So I played Pokemon yellow way back in the day and my Pikachu evolved at level 17 and I never knew why. It must have been that wrong index glitch. That's cool to know

Great video, very well made. +1

Little did he know that he would use the Badge Boost Glitch over and over three years later

YOU'RE DOING WHAT WITH NUMBER 10???

Man, I never knew about that Evolutiin stone glitch. That's just cool. Brock Through Walls is new to me too. There's another beach with no code like Cinnabar's. It't one of tge areas in Seafoam Isles. I can't remember which isle, but I'm pretty sure it's on the East, like Cinnabar's.

That bike glitch is hilarious as fuck lmao, you can literally be like "Fuck you I'm going anyways"

Cool stuff Jrose

I accidentally preformed the exp underflow glitch after cloning a machamp in Pokémon silver once. I had no clue what was happening 😃

I remember finding a pokemon dupe glitch with my brother that involves trading and unplugging the link cable, but that ended up deleting one of our pokemons in the end 😅

Did you watch the glitch showcase they did for gen 1 at one of the GDQ events? A guy actually basically glitched the game up in such a way that strength was usable on the truck, it did push it, and then Mew is encountered. As far as I know that was dont just by crazy memory manipulation and not any kind of mod - crazy!

I remember like figuring out which missingno would screw up your game if you caught them and generally learning the characters of the different missingno. The pokes from the last route You visited before talking to the dude would be on missingnos ledge

Fun fact, when doing item replication you can just replace the 6th item in your bag with another and battle another pokemon instead of flying back to the old man and doing the glitch all over again..... which I did as a kid each and every time I needed lots of items I never thought to just replace the damn item while still in the water 🤣🤣🤣

Okay, so I had a glitch happen to me on my first time playing Pokemon Blue, I don't really know how it happened but I'll try to explain (I took a picture with my 3ds). So I was fighting a Level 40 Muk with my Level 37 Snorlax in the Cinnabar Island building, my Snorlax was poisoned and had 70 health left, and Muk had used Minimize TWICE! I went to see if any of my Pokemon knew Swift and I remembered that my Mew did, I went to Mew and saw that he DIDN'T know Swift...I went back to the battle without switching Pokemon and what happened was, Snorlax was now Minimized and Muk was Mew but Mew was cut in fourth's and placed randomly where Muk was supposed to be. Muk was now Level 37 and Snorlax was now Level 40. It still said that the Pokemon was Muk and I was very confused. Please tell me what this Glitch is called, I need to know.

This brings back so many memories I remember being In class playing this teacher took it away parents had to come get it ..I felt life was over in real time

I knew 9 of the glitches you mentioned, I only didn't know about the evolution stone one

*This is just friendly advice, please do not be offended* You really need to start saying your name at the start of your videos, "Hey everyone, how's it going, it's JRose11" would be enough, don't change the greeting just add your name to it, branding is important, it lets the people know whose video it is, and most importantly who YOU are, I know it seems like people would know(They clicked the video right?), but if your videos are are popping up in suggested, like how I found them, most are clicking because of the thumbnail, It's also important if people start hosting your videos on other sites, because the embedded youtube player most websites use doesn't give a channel name at all, I enjoy your videos and I hope this might help you get your name out there a bit, so others can enjoy them too, I hope in a couple years time I'm one of those guys bragging about being here when you were under 10k subs, when you're celebrating a million, all the best either way, keep up the good work

I ran on that "evolution without stone" Thing, i didnt even know what happened

The brock thru walls glitch is made with how the game gets data for the paths. The moves and the moves pp that bulbasaur has indicates the player coordinates you have when you perform this glitch, and the rest of the moves indicate a path that lets you walk thru walls. Also while youre following a path and your controls are locked, you can go through walls so thats sorta how it works.

Every time I try to remember how me and seemingly everyone other kid on the planet knew about the Missingno/item duplication glitch, I have no recollection of how it came to be. This was not only when we were like 5 years old, but also at a time when the internet was not necessarily a commonplace thing in the household. So I come to wonder how word of mouth started with the glitch that it became so well-known among the general population of kindergarten and early elementary school kids! It's interesting in that it's not like the other glitches meaning you could theoretically come across it by accident, but I feel like someone would have had to tell me to specifically talk to the old man and then surf the coast of Cinnabar.

I remember when I used the missingno glitch, there were encounters with trainers having 255 level pokemon. And it only happen with one specific Pokemon red cassette

I like the glitch that enables you to encounter mew on the nugget bridge

I knew about the guy who taught you how to catch Pokémon but that led to me accidently finding out about pokemon from the safari zone being there on Cinnabar with the right set up.

Yeah, Pokémon Red/Blue have many great glitches for sure.

I always liked catching missingno teaching it fly then letting it evolve

Gen 1 is broken, but thank God I can abuse that to get some sweet competitive mons in Gen 7! Nice video btw.

For the S.S. Anne glitch, you actually have to press right while next to the water and then Start immediately afterwards, save, and then reset. If you don't do this, your character will end up facing downwards instead, and the glitch wouldn't work.

5:26 essentially what happens it it treats it like it subtracting 54 from 0 how ever its a counter so when it reaches the lowest programmed number it will reset to the highest number (look up the civ gandi glitch for a better explanation)

you forgot the exploding bulbasaur glitch in which idk how to do it but the outcome is all your pokemon in the party are replaced with 6 bulbasaurs that only know explosion as 3 of their moves with one other unspecified move that results in using explosion either way (this glitch is actually called the ZZAZZ glitch because the trainer is given the name ZZAZZ* to replace the previous trainer name) *I only put ZZAZZ because it is the short version of the actual name given to the trainer upon this glitch succeeding

Nice video. Some of these were patched in Europe, even in VC re-release of RBY, especially in the French, Italian and Spanish versions if I am not mistaken. Missigno also destroyed my VC save two times, just by crashing the game at encounter when not a fossil or a ghost. Maybe because of the patch. Or maybe because of my trainer name...not sure. I tried Brock Thorough Walls, but it was patched too. :( Trainer fly works just fine.

Thank you bro !!

I like how you explain why you think it deserves a spot.

So I have a really funny glitch story. So I caught I believe it's called Female Symbol not sure but it has the Cool trainer moveset. And while battling wild Pokémon. It kept pulling random Pokémon from my pc. I had a jigglypuff named ballsack and a parasect named derp. And it came out to be ballderp. It was great. I'll put it up on my twitter if you guys want

Btw eastern shore of Seafoam islands can also be used in a similar fashion to the Safari Zone and Missingno tricks.

The old man glitch and the zinnober glitch where the ones I used as a chield. I used my masterball before I knew the old man so I just had rare candys. My last Pokemon of all 150 Was tauros. I Catched him through the zinnober glitch. I'm surprised this wasn't a glitch everyone knows. In my friends circle everyone knew it.

Using Trainer-Fly to get a pokémon that can trigger the Experience Underflow glitch is actually tremendously useful on the Virtual Console versions. Level 100 on the Medium-Slow experience group (which triggers the underflow) yields a Timid nature when transferred to Poké Bank. And a lot of special attackers (the Nidos, Gengar, Alakazam, Mew...) happen to be in that group, they get another benefit.

Me before video: pfft I know EVERY glitch! Me after first glitch: I didn't know that!

Holy crap. I think I accidentally hit on the Evolutionary Glitch as a kid. I remember beating Gary in the Lavender Tower fight and then my Pikachu immediately trying to evolve into something. I was freaked out but also super curious as to what it'd become. Unfortunately, I wasn't really ready for that Pikachu to evolve, so I canceled the evolution and it's been bugging me ever since as to what he'd evolve into. Guess it was Raichu all along. Huh.

By the way, Brock through walls most likely sets 0xCD38 from 0 to 1 indicating scripted player movement which unsets after the script has run it's course or after some certain events like certain map changes. As long as 0xCD38 is active (Non-zero) all collision detection is disabled globally. You can manually trigger this in memory editing (For an emulator) by setting 0xCD38 to 1 and back to 0 when done or through gameshark by, I think, 0138CD01 if I translated that correctly but make sure to disable when done back to 0 (0138CD00) Since it's simply far too easy to walk into invalid areas immediately crashing the game.

#6 isn't considered a glitch, and the reason why it occurs is not because Cinnabar Island is poorly programmed, but rather because the Pokemon encountered on the coast of Cinnabar is determined by the Pokemon available in the last area you were in (which is why MissingNo. is a thing). So it works with any place you can encounter Pokemon, rather than just the Safari Zone.

My favorite glitch as a kid is getting the baseball bat item and if you hit an NPC that is also a pokemon trainer you will get their pokemon game, the version is generated randomly using an RNG (Random number generator)

Fun fact Jrose Nintendo Power was actually right when they said catching Missingno would crash your game. They just didn’t say it wouldn’t happen every time. Actually had my save data corrupt after catching one on my Red version when I was a kid. Friend of mine had his corrupt on Blue a few days after as well.

Which I knew about this back in the day!

looks like your capture card is registering the game’s resolution as an interlaced video format

I fucking love the little New confirmed and other little tidbits like that

In case someone asks, yes, all of these glitches are usable in the virtual console releases of the games. Its pretty cool. I use the Mew glitch and the Missingno/dublicate items glitch to get easy competitive Pokemon in Gen 7, cause believe it or not, Pokemon that are caught via the Mew Glitch can transfer to Gen 7, except for Mew.

I remember that Safari Zone glitch! That's how i caught the Safari Zone pokemon. I felt so naughty using that glitch lol

Whoever found these glitches must’ve stayed locked in their room for a very very very and i mean very long amount of time😂

“Hey sorry roads closed” “Alright thanks!”🚴‍♀️

"Beating off with number 10" 0:41

How do you get surf before hm for some reason when I restarted my game to get Mew I wasn't able to find Nidoran!?!?

I knew 10, 9, 6, 4 & 1. Good video.

I have Blue Version in real life, cart and save still working with my GB SP. Now I wanna play it XD