There are two ways of getting this Pokemon into your copy of Pokemon Platinum.
1. From January 3 - 9, you can get a free shiny Raikou from any GameStop or EBGames. Here's how:
NOTE: You must have obtained the Pokedex in your game and have no more than 2 wonder cards. If so, you must delete one.
NOTE: Make sure you have atleast one open spot in your party.
2. You have to import it from fire red, or leaf green. To get it in Fire Red or Leaf Green, you must pick Squirtle and look for it.
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Houndour, Houndoom, Lillipup, Herdier, Stoutland. Legends: Entei, Suicune, and Raikou. Find them in Pokemon Platinum, Black, Heartgold, and Silversoul.
you can find them in Pokemon leaf green /fire red after you beat the elite 4 and the champion Charmander - Suicune Squirtle - Raikou Bulbasaur - Entei how do you find them?
raikou cannot be caught on Pokemon ruby
you have to migrate them from fire red or leafgreen or u trade them form gold silver or crystal to ruby and Sapphire then migrate to platinum
You cant get raikou in Pokemon diamond or Pokemon pearl.But you can get him in a gba Pokemon game and transfer him to your Pokemon pearl or diamond!