Catch the pokemon in a luxary ball, walk around with it, give it vitamins, rare candies, and certain types of berries, and don't let it faint in battle.
They way you get happiness is when you battle with the Pokemon all the time! An example is my Jolteon, I used to battle with it all the time. Which had it's happiness sky rocket. Which they will listen to you more without missing!
you must do battles and there happiness goes and at some point they evolve.(P.Spokemon that evolve with happiness all evolve at a certain amount or number of happiness.)
all the pokemon
All bright hues in nature express happiness except the dark shades of blue and black .
I don't know what all the Pokemon's names are but all the Pokemon are new....
Go to the Pokemon cente in eterna and talk to the lady with brown hair and she will give you the happiness app (the one with all your Pokemon floating around and bumping into each other). Hold your stylus on apokemon of your choice and if 2 big hearts come out of it, its happiness is near if not full.
trade from pokemon white sorry that all ideas i have to get tundrus in pokemon black
All the starters evolve in Pokemon Black. Many other Pokemon evolve as well.
you will have to trade Pokemon with Friends
Pokemon hide in the grass.
Trade for them.
I put a link to guide on all the legendary pokemon in Pokemon Black in the related links.