Whenever you want. Bare in mind that Raichu won't learn any new moves as you level it up, so just make sure your Pikachu has all the moves (that it learns via leveling up) you want it to before you evolve it.
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no he doesnt so you should train him until he learns thunder then evolve him
Yes. When Pikachu has enough happiness, level it up then it should evolve. Then you can evolve Pikachu by using the Thunderstone to evolve Pikachu too Rachui. Remember: Rachui CAN NOT EVOLVE.
The Pokémon that evolve via the Thunderstone are Pikachu which evolves into Raichu and Eevee which evolves into Jolteon.
It doesn't. Pikachu learns all the moves when you evolve it it will stop learning moves.
Pikachu do not evolve by level. They evolve when a thunderstone is used on them.