It doesn't evolve you have to use a thunderstone, but in Pokemon yellow you can't do that to your pikachu unless you get another one from Red or Blue.
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Pikachu learns Thunderbolt at level 29.Pikachu learns Thunderbolt at Level 29.
It evolves at level 42. It evolves into glalie.
You have to use a dusk stone on it and you will get a chandelure
Pikachu learns thunderbolt at level 26.
Pikachu learns slam at level 21.