You can't the only possible way to get rayquaza in platinum is to transfer it from emerald, get it at GTS (you must have seen a rayquaza to get it at GTS) or use AR (Action Replay). hope this helped.
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Pokemon platinum
Yes, Pokémon Platinum was created to be a Nintendo DS game so it can be played on all of the Nintendo DS systems which includes the original Nintendo DS, the Nintendo DS Lite, the Nintendo DSi, the Nintendo DSi XL, the Nintendo 3DS and the upcoming Nintendo 3DS XL.
action replay
impossible
When Pokemon Platinum came out, Nintendo prevented Action Replay from making cheat codes for platinum