you have to make it happy you can do this by massages and giving it proteins
you evolve pichu with happiness and freindship.you can also give him beris that make it frendlier
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pikachu then pikachu evolves with a thunderstone to get raichu
Pichu evolves into Pikachu.
Yes. Pichu evolves into Pikachu ( which turns into Raichu if you use a thunderstone) at level 22. Pichu is an electric type pokemon.
you can't hatch a pikachu egg on diamond, it hatches in to a pichu.
Pichu evolves into Pikachu when it has full Happiness. To increase its Happiness, you will need to level it up, feed it friendship boosting berries, walk around with it in your Party, take it to have a massage or haircut (depending on the version you are playing.), and/or give it stat boosting vitamins.