use action replay
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Yes but it does not involve the special features that are offered by the platinum version
U can't but u can trade from d/p and platinum or use cheats
if you have action replay you will get to pick a pokemon so groudon is a hard pokemon you need the red orb for groudon on pokemon soul silver version or pokemon heart gold version but use action replay on pokemon pearl,diamond,platinum
There are no definite cheats for Platinum, but if you buy a DS action replay it comes with some cheats for that game(Use at own Risk).Many of those cheats tends to mess with your game.There are walk throughs for tips and tricks for that game though.
The answer is use Pokemon fire red cheats.