The oval stone can evolve happiny into chansey, only if; happiny is holding it, and the time you are in while levelling happiny up is day time.
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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.
The Oval Stone is an item in the Pokemon games which can be used to evolve certain Pokemon. For example, it can evolve Chansey.
The Oval stone evolves Happiny into Chansey.When Happiny is really happy, give it to her told hold then level her up by 1; she should evolve.If not then she's not happy enough.
You can evolve happiny with an oval stone after its friendship is high
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