how to increase a pokemon's happiness
There are only two ways to increase a Pokemon's happiness. One way to increase a Pokemon's happiness, is to consitantly use it in battle. (Or in other words: Use it to fight alot). Another way to increase their happiness, is to feed them many, many poffins. A tip on the poffin one. If you look at your Pokemon's summary, you can find out what kind of poffins they like.