Um...happiness??

Why, yes, I know several other ways to raise your Pokemon's happiness level. If you give your Pokemon vitamins and minerals such as Calcium, and Protein, then that will increase their happiness level. Calcium, Protein, Zinc, Carbos, Iron, these are only a few of the vitamins that you can feed to your Pokemon to increase their happiness level with you. If they are hurt in a battle, and you heal them with a potion, or something similar after the battle is over, then they will like you more. On that note, the longer each Pokemon stays alive, and does not faint in battle, the more they will start to like you. There are also certain berries that you can give your Pokemon that will make them like you more. This comes hoever, with a price. It may make their speed decrease, or their attack. I am not sure, it depends on what berry that you use.

Well, those are some other ways that you can increase your Pokemon's happiness level apart from battling with them.

Hope this helps.

You can give them poffins

You can give them poffins or make them hold a shell bell.

The best and fastest way to raise a pokemons happyness is by battling even if it is against weak Pokemon so have it battle alot even against the weak Pokemon and it will become happy

You give it Stat raising items such as protein and iron. Give it lots of these items and it should have a high liking towards you.

I hope I helped.