If you don't have your shiny Pichu from pokemon Wi-Fi mystery gift, then go on Wi-fi and search for a gift.
If you don't have your pokemon diamond/pearl/platinum mystery gift, you should really watch this video,

I just got mine yesterday,

.
This is the pokemon you'll get after searching on Wi-Fi using your mystery gift ( title screen to find mystery gift menu ) :
Pichu@Everstone
PokeDexNumber - # 172
Level - 30
Caught with - Cherish ball ( red cool looking poke ball )
OT - SPR2010
ID - 03050
Moves :
~Charge
~Volt tackle
~Endeavor
~Endure
Get your shiny Pichu from Wi-Fi mystery gift today.
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I like to play cbeebies games