THINGS THAT YOU NEED:
*A male picachu
*A female picachu
*A light ball
NOTE* This only works in Emerald.
This is what you have to do. Go to the Safri Zone, and catch picachu. You have to try to find a picachu holding a light ball. This is rare so it might take awhile. When you find it, put a female and male picachu in the daycare, but make sure one of them is holding a light ball. pretty soon, there will be an egg and a pichu is inside of it. One of the moves it will know is volt takle which is very strong. I tryed this and it works.