it matters what Pokemon you mean. Most Pokemon evolve by leveling up, others with stones and items, some by friendship or condition (some at certain times), and still more by trading!
mightyena doesn't evolve on Pokemon pearl, he doesn't evolve in any Pokemon game!
you can not evolve it
I does not evolve
snesel can'NT evolve but can evolve in Pokemon diamond, pearl and platinum snesel can'NT evolve but can evolve in Pokemon diamond, pearl and platinum
octillery doesnt evolve
Yes Corphish does evolve in Pokémon Pearl.
it doesn't evolve
it doesn't evolve
they dont evolve... even i know that
No Pokemon can evolve with a hard stone
No.
No.....