lvl 44
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.
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.
Sealeo will evolve at level 50 to Walrein.
in the pokedex, the Pokemon who has the number 365 is Wallrien. to obtain, you must transfer a spheal from pokemom pearl, then evolve it into a sealeo at 32 and then wallrien at 44
By leveling it up.
Sealeo evolves from Spheal at level 32. Sealeo and Spheal can both be found on Routes 226 and 230.
try level 44
Train it to level 45.
Level 44.
walrein, the evolved form of sealeo.
sealeo evolves into a walrein in level 44.. good luck in your Pokemon adventure
Level 44 :D