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Pokemon Diamond and Pearl: Leafeon and Glaceon
Leafeon and Glaceon are the first additions to the Eevee family. Evolving them is very easy. All you have to do is go to the respective rock and level up your Eevee once in the surrounding grass. The moss rock for Leafeon is in Eterna Forest and the ice rock for Glaceon is on Route 217 south of Snowpoint City.

Note: You can use a Rare Candy on your Eevee in the grass to make it to evolve.