the easiest way (without hacking rare candies) is to beat wild pokemon, specifically audino because they give out more exp. points than regular pokemon. just run back and forth near some grass with high level pokemon and once you encounter a shaking patch of grass, it will most likely be an audino.
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In my opinion, I always goto the elite four (aftergame) and replay them. You can also goto the east side of Unova and fight wild pokemon.
Defeating Pokemon that are a higher level that it, or Rare Candies.
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
there is no way, all you have to do is the slow boring way. sorry
Level it up to level 50, then it will evolve into Zweilous. Level it up to level 64, to evolve it into Hydreigon.