Mew
sometimes
Mystery Gift is already unlocked on HG/SS.
Mystery Gift.
You have to be connected to wifi.
no ;)
You get special Pokemon. For right now, for Pokemon Black and White, you could receive an Darkrai by using Mystery Gift. These special Pokemon are known as Mystery Gift Event Pokemon.
The mystery gift option is already available in Pokemon HeartGold and SoulSilver. Before starting your save file, there is a menu option that says 'Mystery Gift'. It is already built into the game.
The mystery gift option is already at your disposal. Unlike in Diamond and Pearl, you already have the mystery gift option. Before accessing your save file, just scroll down to the mystery gift option.
An exclusive Mew is coming out for mystery gift for the games Pokemon Heartgold/Soulsilver in Japan only.
If your referring to the pikachu colored pichu, then your out of luck because it was only available from march 5 to march 25 of 2010, through the mystery gift feature on Pokemon diamond, pearl, and platinum and then trade it to Pokemon heartgold or soulsilver.
lucky for u a mystery gift that is out right now will give u a jirachi
wifi