How do you train your Pokemon quickly?
Just put it in the first slot so it will be the one that comes
out when you throw the pokeball, and keep your strongest Pokemon in
the other slots so if it faints then you can get out of the battle
quickly. Another way without battling is to put them in the daycare
and ride your bike around in circles. (tip: you can buy some repel
to keep track of your steps) That will get their level up.