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How does how you treat your Pikachu in yellow affect how your rival evolves their Eevee??

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I want to know. Also how does it turn to each evolution (Jolteon, Vaporeon and Flareon) and how do you do it? If you can, tell me. Please answer this question! :)

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Gary/ your rival's Eevee doesn't evolve based on your Pikachu's happiness.

>The rival will eventually evolve his Eevee (and thus affect which are the other members of his party) depending on the player's actions early in the game:

>- If the player beats the rival at both the Oak Pokémon Research Laboratory and the early optional battle at Route 22, Eevee evolves into Jolteon.
- If the player loses one of these two battles or passes up the Route 22 battle, Eevee evolves into Flareon.
- If the player loses at Oak's Lab, and loses or passes up the Route 22 battle, Eevee evolves into Vaporeon.

I guess your Pikachu's happiness is linked, as winning battles will make it more happy, but that in itself doesn't determine your rival's Eeveelution.

Pokemon Yellow - Bulbapedia

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Thanks once again Fondant!!! :D
That's smart.. Basically, if you were having a really hard time against him, his Eevee evolves into  a Pokèmon with an electric weakness. If you're doing all right, it evolves into something neutral, and if you're doing really well, it evolves into something harder for a Pikachu to defeat.