There is no such thing as a "picahu", but you probably just mispelt it. No worries, PIKACHU is an electric type mouse Pokemon that evolves into Raichu with the aid of a Thunder Stone, and if you breed it, you get a Pichu.
first, he has a picahu lv88, lapras lv80,snorlax,lv82, charzard lv84,blastios lv84, venisour lv84. need anymore help on Pokemon soulsilver contact me at nkapler@gmil.com
you can't you have to have to level up to level30-40 and bring lots of oran berry, reviver seeds and it's easy.i used a level 39 picahu