By not letting your Pokemon die (It's this way in every game)
raise its happyness to max
You need to raise its friendship not raise its level.
day care
lv on low Pokemon or give it xp share
Pokemon like to be in the front of your party, they also leke to get massages (srry if i spelled that wrong). some berries raise happyness but lower power. a Pokemon likes to hold items too, so give them plenty. a sooth bell raises happyness when held, so that works too. and lastly, they will be thrilled if you use stat boosters. hope your Pokemon warm up to you
you have to catch a duskull on route 224 and raise him to get dusclops
raise any boy burmy
just train them or use rare candies
you need to raise the feebases beaty as high as possible with poffins
feed it a sour poffin, you can get a poffin case in the Pokemon fan club.then make poffins at the poffin house.
Well happyness is not something you teach (i could be wrong) but if you want your pokemon happy ( think that this is what you want) to go goldenrod city and give it haircuts (all pokemon) hp ups and other things like thta will also raise the pokemon's happy status!! I hope this helps!
To evolve Milotic you must raise its Beayty stats with certain pokéblocks to maxim