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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, exclusively for the player's partner Pikachu in Pokémon Yellow: Special Pikachu Edition, though all of the Pokémon generations after that featured it for all Pokémon.
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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