The Pokemon that will evolve through full happiness or maximum happiness are Cleffa, Igglybuff, Pichu, Riolu, Togepi, Golbat, Chansey, Azurill and Budew.
You have to evolve BUNEARY with full happiness.
Level it up when it its happiness is full
Golbat evolves into Crobat in Pokemon Emerald by full happiness.
Chingling will only evolve into Chimeco if it's happiness is full at night time.
To evolve a Flying Pichu, you must get it to full happiness, then you can evolve it into a Flying Pikachu.
On full Happiness. :)
Use golbat a lot and he must never faint. He's happiness will increase and when it is full it will evolve
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.)
Happiny (at full happiness) thats all i know. there might be more
Level up an Eevee with full happiness at nighttime (after 6pm)
It shows how much the Pokemon is happy with you. In some Pokemon you can evolve it if it has high happiness.
You evolve it by raising it to maximum happiness.