Buy the game. Pokémon Black and White have an anti-piracy code that prevents your Pokémon from gaining experience when you are playing a pirated version of the game.
cheat
it doesnt evolve by leveling up its by filling up its happiness.
Pokemon evolve when you level them up to a certain level, by trading them, by friendship, or by using stones.
you level it up 50
take a weak pokemon to the elite four
Get a female Combee and level it up to level 21.
You can only level it up by, high friendship
You'll need to level it up to level 30.
To evolve Mantyke in pokemon black/white 2 you have to level it up with a remoraid in your party then it will evolve into mantine
According to my sources level 100
the only way to get it is to level tynamo up to level 39
Have a friend with pokemon white 2 host the funfest mission