Sealeo evolves into Walrein at level 44 in Pokemon Pearl. Walrein can't be caught in the wild on Pokemon Pearl and must be evolved from a Sealeo.
lvl 44
Sealeo evolves from Spheal at level 32. Sealeo and Spheal can both be found on Routes 226 and 230.
Sealeo and it's evolutionary chain are exclusive to Pokemon Pearl. This means the only way to get Sealeo on Pokemon Diamond is to trade with a game of Pokemon Pearl.
mightyena doesn't evolve on Pokemon pearl, he doesn't evolve in any Pokemon game!
evolve snowver at level 40
Buizel evolve at level 26.
IT DOESN'T EVOLVE
level 18
at level 30
level 50
Level 18
Level 20.