Put them in the daycare together
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Ditto
No. When it hatches from the egg it will be a Pichu. Then you can evolve the Pichu though friendship it will become a Pikachu.
Breed a female pikachu with any Pokemon from its breeding group or any pickachu with a ditto.
Yes. You can either breed a pikachu and a ditto at the daycare center or trade a pichu from another game.
any Pokemon can breed with ditto except legendary Pokemon and ditto. in other words, you can't breed a ditto with a ditto