By attacking Pokemon in the grass, on water, in sand, caves or battling trainers. It's really simple.
Train them............
exp. share
Have a friend with pokemon white 2 host the funfest mission
level him up to level 36
Level up to level 30
level it up to level 64
level it up
Level him up to level 47 to get a Vanilluxe.
You have to level it up, by defeating other pokemon. There is an experience bar showing how far they are from the next level - they level up when this bar is full.
just level it up a bit
You don't. Your Pokemon has to level up to learn it.
Get a female Combee and level it up to level 21.