SD Gundam Generation World (PSP) - Custom Challenge [49] FINAL03 ヘル・ロード 

Welcome to Hell Road. Excuse the little bit of speeding up around 4:05. I initially planned on recording this to more commercial music but I changed my mind as I wanted to capture the unique track that plays during the final boss' appearance (though I can't remember if it isn't played anywhere else.)
You can only deploy one group. I brought my Lv88 Turn A (Dark History) with my Lv91 custom character so I have infinite Chance Steps. For Option Parts, I have the usual set of アンリミテッドユニット (Unlimited Unit, x2 damage and all attacks cost 0 EN, though you still pay full MP costs), アストナージ・エンジン (Astonaige Engine, +50 to unit Attack and Mobility) and プレミアム・EXAM (Premium EXAM, Special type weapons have their attack power increased by +50%).
There are 3 sets of 3 enemies on each side. Each of them has horribly inflated stats. Even the simple RX-78 with originally 12,000 HP and 22/22/21 has been inflated to 32,000 HP with 102/102/101, so we're looking at +80 (assuming later units don't come with higher increases either.) For reference, my Lv88 Turn A has the equivalent of +121. Their pilots are no slouch either with an average of 70 in all combat stats.
Once you kill off any single set, a fresh new set of different enemies will spawn from the matching side. The spawns come in a set order and theme as you can see. Once you kill enough of any one side, Barbatos will appear. Defeating it ends the stage and rewards you with 99,999,999 capital (that's why I started with 55, I spent everything I had collecting battleships.) Oh right, you also need to do this within 16 turns.
Even at maximum Tension and having maxed 冷徹 (Coolheaded) to reduce the target defence by 15, I barely one-shot the Barbatos. I actually tried having my Lv49 Turn A with 69 in all stats (this wasn't planned lol) fight the top set normally. It took no damage from the Guncannons since its I-Field ability neutralized their beam rifles. However, my 4000 attack power beam spread attack did a mere 22!!! damage to them. I took 7403 damage from the RX-78's beam saber.
That said, now that I think about it, I don't even need someone with Infinite Chance Step. With a sufficiently strong unit with good attacks (like that Turn A) and the Unlimited Unit, you can just kill them with counterfire and even if you don't kill the Barbatos in one hit, you should hopefully be able to kill it the next turn while surviving a hit from it if it happens. It's definitely the best place to farm character experience in the game with a fully leveled up Turn A. For unit experience, it's a bit less optimal due to all the enemies being placed behind impassable areas.
Anyway, that's pretty much all of the unique content in Gundam Generation World. I did end up recording a few more experiments I did as well as an attempt on Hell Road without using the Unlimited Unit and Infinite Chance Step abuse, so there's a few more videos if you still want more. Either way, if you've made it this far, thanks for watching.