If it is shiny or Pikachu coloured then it is
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Go to the Mainson on route 212. in the backgarden will there be plenty of themm - PLATINUM :D
It is really hard to get one. On Pokemon Platinum you need to find PIchu/Pikachu and catch it or use thief and if your lucky enough it will be holding a light ball. I
In order to catch the Spiky-eared Pichu, you first need the event Pikachu-colored Pichu that Nintendo released either at U.S. GameStop stores or via Nintendo Wi-Fi Connection. Once you have this specific Shiny Pichu, the Pikachu-colored Pichu, you need to have it as the lead Pokémon in your party and then you have to go up to the shrine in Ilex Forest and then you'll be given the Spiky-eared Pichu. There is no need to catch it.
pikachu then pikachu evolves with a thunderstone to get raichu
you go to the trophy garden behind the Pokemon mansion.