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One needs to increase Chansey's happiness to its maximum.
there are no male chanseys in pokemon diamond, perl, or platinum. get a ditto instead.
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.
you cant... you have to make chansey evolve with high friendship. you can find chansy on rout 209 in diamond, pearl, and platinum
Give it to your Happiny at day time and level it up to evolve it into a Chansey.