Pikachu only evolves with a thunderstone
Pichacu does not evolve by level, you have to use a thunder stone on it to evolve it. You don't have to do this though, it's optional.
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I used nanab and it goes by the best
It is suppose to evolve at the Level of 20,but if you want it to evolve later it can evolve anything after it is at Level 20.
It will evolve by level. Teddiursa will evolve into a Ursaring at level 30.
They evolve at level 36
It will evolve at level 36.