Does it even evolve by level?
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Pikachu actually doesn't evolve by level. The only way to evolve it is to use a Thunder Stone on one. You can buy them at the Celadon City Pokemart.
It also appears that there is a glitch that if a Pikachu and Growlithe both participate in a battle and both gain exp, and Pikachu levels up, Pikachu will evolve. I haven't tried it myself, but it looks like it might work. It's still probably easier just to use the Thunder Stone, though.
I hope this helps.
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