Only Happiny can evolve with this item. When Happiny holds the oval stone during the day, it evolves into Chansey when leveled up at any level.
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The Oval Stone is an item in the Pokemon games which can be used to evolve certain Pokemon. For example, it can evolve Chansey.
You can evolve happiny with an oval stone after its friendship is high
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.
I think you evolve Happiny into Chansey with the oval stone? They have to hold it and level up I think?
give it the oval stone when it has high friendship