Well, since you do have a breeding shop, I'll do you a huge favor & offer you some words of wisdom:
If your female Pokémon has a great nature (in your case, if your female Pikachu/Raichu has something like a Modest, Hasty, Naive, Rash, or Mild,) try putting an Everstone on her before putting her in the daycare center to breed. That way, the resulting baby Pokémon will be likely to have the same nature as its mother.
Also, it helps to have a Pokémon with either Flame Body or Magma Armor in your party, as it cuts the incubation time for your eggs in half.
Hoping that it helps you.