So interesting thing I learned, the entire Metagross evolution line has a Pokedex entry that refers to it being comprised of multiple Pokemon Metang: "When two Beldum fuse together, Metang is formed. The brains of the Beldum are joined by a magnetic nervous system." Metagross: "Metang combined to form it. With four brains, it has the intelligence of a supercomputer." MEGA Metagross: "This form results from one Metagross, one Metang, and two Beldum linking up." This means that if you add a Mega Metagross to your team then that makes for a total of 8 Pokemon in 1 (P.S. If you don't want to count the individual Zygarde Cells as Pokemon then you can still count the Zygarde 10% forms as Pokemon which would make Zygarde 100% form a combination of 10 Pokemon in 1) (P.P.S. I know Palossand might not count since humans/human souls don't count here and it's unconfirmed if Palossands grains of sand have a will of their own because of human souls or not, BUT Stakataka is said to be made up of many life forms stacked on top of each other, so that one may count. And if anyone argues that Ultra Beasts aren't considered Pokemon then I gotta hit them with Poipoles dex entry: "This Ultra Beast is well enough liked to be chosen as a first partner in its own world." Which implies that Ultra Beasts ARE Pokemon in their respective dimensions and some are more common and more rare while others are even starters. So Stakataka could count as well)
Although it's not obtainable in Scarlet & Violet, Mega Metagross is made up of 1 Metagross, 1 Metang, and 2 Beldums. A Metagross is 2 Metangs, and a Metang is 2 Beldums. So the total number of Beldums in this form are (2 x 2) + 2 + 2 = *8* Also, I would argue Zygarde-Complete counts as 10 Pokemon, since the Zygarde Cells can't really battle until they reach the 10% form.
Since everyone's talking about Palossand, I set out to see how much Pokémon it really is in one, using math. It weighs 250 kg, and a quick Google search gave me that a grain of sand weighs around 0.00001562 grams. Discounting the shovel and gems, it would probably be around 240 kg of sand, or around 15.36 billion grains of sand. Multiply that by 6 and you've got the answer of 92.19 billion being the highest amount of Pokémon you could carry on one team.
Have you ever heard of Stakataka? Fun fact, Stakataka is composed of 150 individual lifeforms (yes, every single brick on Stakataka is its own lifeform).
There are between 247 and 262 solo wishiwashi in a school form wishiwashi. Using lbs, school is 173.3 lbs and solo is 0.7 lbs, 173.3/0.7 = around 247 wishiwashi. Using kg, school is 78.6 kg and solo is 0.3 kg, 78.6/0.3 = 262 wishiwashi.
if Zygarde 10% forme is possible than complete forme is made of 10 Pokemon (10 Zygarde 10%s) Mega Metagross (it's made of a Metagross which is made of 4 Beldums, a Metang which is made of 2 Beldums and 2 other Beldums for a total of 8 Pokemon) every brick from Stakataka and every grain of sand from Palossand have their own conscience, so those two should both be mentioned as 150 and roughly 16,005,000 pokemon respectively if you account for Palossand's shovel which would on average weigh about 32 grams leaving Palosand as 24,968 grams or 3,857,595 grains
