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Happiness is a Pokémon feeling that depends on how much the Pokémon loves its trainer. This was first introduced in Generation II.

Games[]

Pokémon Yellow[]

This game only features Pikachu via happiness. The more time the player spends time with its Pikachu, the more it likes it.

Pokémon Gold and Silver[]

Eevee evolves into Umbreon if it reaches a high enough level of Happiness at night.

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