The only Pokemon is Happiny>Chansey.
for evolving Pokemon
Catch a Chansey on route 209 or 210 and usually they have one with them
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 evolves into Chansey with an Oval Stone.
Happiny uses the Oval Stone to evolve into Chansey.
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.
Hapiny + Oval Stone = Chancey
The Oval stone evolves Happiny into Chansey.
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.