It will evolve a happiny to a chansey (but if you do that on Pokemon diamond or pearl i don't think you can get another happiny so beware!).
Happiny evolves into Chansey with an Oval Stone.
Chansey evolves from an Oval Stone.
Happinny is the only Pokemon that can evolve with the Oval Stone.
The Oval stone evolves Happiny into Chansey.
happini can evolve with a oval stone
Happiny. You need to make it hold the Oval stone and level it up before it evolves.
Happiny
The Charzard evolves into a Charmander.
Happiny evolves into Chansey. It evolves with a oval stone in the day
Hapinny
togetic
weedle it evolves into weelord trust me it works