Train them............
Have a friend with pokemon white 2 host the funfest mission
Its the same either way.
You don't. Your Pokemon has to level up to learn it.
A shiny Pokemon is no different than a regular Pokemon in stats or growing levels.
There are probably some game-shark codes that do level your Pokemon up FASTER in the daycare. If your Pokemon is in the daycare it will gain EXP. with every step you take.
you train them
if you want to level up your pokemon faster. give the pokemon you want to level up an exp share but it at the bottom of your pokemon list and battle and beat the elite4 in succession over and over until it is at the level you want it to be.
PKRS stand for Pokerus. It is a virus in your pokemon that allows it to level up faster. It is a good thing to have, even though it is common.
lucky egg
You get a lucky egg in about half way through the game. Also trading with someone.
take a weak pokemon to the elite four
exp. share
YOU HAVE TO GET ALOT OF rare candy.
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