How can you get happiny?

Answer 1

You can either go to Hearthome City and talk to the man (who looks like a hiker) just before route 209, and he'll give you a Happiny egg. Or you can catch a Chansey (routes 209 and 210) and breed it. If you need help on egg groups just go here:

http://Pokemon.marriland.com/diamond_pearl/pokedex/list

hint: to breed a Pokemon you need to put a male and a female Pokemon in the daycare center who are of the same egg group. On this site just click on a Pokemon and then click on egg groups so you can see a list of conpatible Pokemon.

Ps: Not all Pokemon can lay eggs.