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His Eevee will become Jolteon if you beat him at Professor Oak's Lab and at the optional battle at Route 22, provided you beat him just at Professor Oak's Lab then his Eevee will become a Flareon and provided your Rival beats you at the Lab and the optional battle on Route 22 or you lose at the lab and you skip the Route 22 battle then your Rival's Eevee will become a Vaporeon.

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Q: In Pokemon Yellow what does your rival's Eevee evolve into?
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