Pickachu will not evolve in Yellow; it will refuse the Thunderstone, but if you trade your Pikachu from Blue or Red, you can evolve it with a Thunderstone then.
Chat with our AI personalities
If this is the case, you're playing Pokemon Yellow. Yellow prevents the starter Pikachu from evolving due to following the anime, where Pikachu refuses to evolve (though it's possible to evolve it by trading it to another game, evolving it there, and trading it back to Yellow).
You cannot evolve Pikachu in Pokemon Yellow, unless you trade it to a red or blue version, and give it a thunderstone there. Once you get it back it will not follow you.
The Pikachu you start with in Pokémon Yellow will not evolve because the Pikachu in question is based on the Pikachu that belongs to Ash Ketchum of the Pokémon TV anime. Ash's Pikachu won't evolve because he likes himself just the way he is and prefers to stay that way rather than chage.
Pikachu doesn't evolve through leveling up. Pikachu evolves into Raichu with the use of a Thunder Stone.Note: in Pokemon Yellow, your starter Pikachu will refuse to evolve unless traded to another game.Other facts:Pikachu is number 25 in the National Pokedex, and evolves from Pichu when you have high friendship.Give it a Thunder Stone.trade a yellow shard to the treasure man near mossdeep city. then use the thunderstone he gives you on pikahchu. use it on him, not give it to him.
Give Pikachu a Thunder stone and it will evolve into a Riachu. But in Pokemon Yellow, the Pikachu will not evolve. You can get thunder stones easy by mining them in Pokemon diamond and pearl but in soul silver and heart gold you need to buy them with athleet points at the athleet shop