There are two ways to get Larvesta:
Either way, you end up with a Larvesta Egg. Larvesta's don't appear in the wild, unless there is some ActionReplay code for it. Though, I personally don't recommend using an ActionReplay because it messes with your game.
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Larvesta evolves at level 59 in both Pokemon Black and Pokemon White.
You can't, It is only obtainable in Pokemon Black or White. But if you want one in Black or White, a Pokemon ranger will give you an egg of a Larvesta in Route 18 so remember to make room for it!
you will get larvesta, a bug/fire type pokemon.
Larvesta evolves into Volcarona.
The Pokemon hatched is LARVESTA, the bug/fire Pokemon.