The best way is to use cheats or action replay.
Yes if you want it on pearl
Yes, on pearl you go to the palpark and you transver 6 Pokemon from Sapphire to the pearl game from the menu.
Raikou isn't on Pokemon Pearl, if you want it you must transfer it from another game
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Well i know that u cant but if you want to play as a Pokemon you might want to play Pokemon Explorers Of Sky!
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yes
missingno is a Pokemon which you will not want to capture because it crashes your game
GO TO pokesav.org MAKE YOUR OWN POKEMON!!!
you can't unless you have another Pokemon pearl so you can migrate your Pokemon after the league
you probably want to play it if you dont want that as your answer please improve your question
Whatever one you want?