ANSWER A PERSON WILLING TO GIVE YOU A PIKACHU 4 A RAICHU. I HAVE 2 PICACHUS 2 TRADE.
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You can't. The only way to get Raichu in Pokemon yellow is to trade your Pikachu to another game, give it a thunderstone, and then trade it back. I don't suggest this however, as once it is evolved into Raichu it will no longer follow you around in-game. Your best bet - if you want to take the time - is to catch a new pikachu (not available in yellow) on another game and use the thunderstone there and then trade it.
Pikachu will evolve into Raichu when given a thunder stone. If you mean Ash's Pikachu, then it very unlikely he will evolve his Pikachu, as Pikachu is the Pokemon Franchise's mascot.
Pikachu turns into Raichu.
Raichu is the last form of the Pikachu family.
Raichu