you can find one on the ground in Lost Tower, or you could catch a chansey or happiny holding one.
Happinny is the only Pokemon that can evolve with the Oval Stone.
The only Pokemon that can be evolved with an Oval stone is a Happiny into a Chancey.
Happiny uses the Oval Stone to evolve into Chansey.
Happiny evolves into Chansey with an Oval Stone.
The Pokemon that can use oval stone in Pokemon platinum is Happiny. It is the pre evolve form of chansey. Mostly every chansy you catch have a oval stone.
Chansey evolves from an Oval Stone.
The Oval stone evolves Happiny into Chansey.
Hapiny + Oval Stone = Chancey
happini can evolve with a oval stone
The Oval Stone is an item in the Pokemon games which can be used to evolve certain Pokemon. For example, it can evolve Chansey.
oval stone is for certain bird Pokemon
Happiny---->Chansey using the oval stone.