Rayquaza is not obtainable anywhere in the region. However, if you have Pokemon Ruby, Sapphire or Emerald and you catch Rayquaza there: you are able to transfer it over from one of those games through Pal Park. Keep in mind that you must have beaten the Elite Four in Pearl, Diamond or Platinum;and you will have to transfer five other Pokemon along with Rayquaza to Pal Park; and those Pokemon can NOT know any HM moves whatsoever.
You can choose any Pokemon you want. If you choose your strongest most powerful Pokemon, you may have to start your game over.
YOU HAVE BEEN WARNED.
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No sadly there is no way to catch Rayquaza in Pokemon pearl diamond or platinum except use action replay, migrate it of your gba (if you have it) or use the world trade center thingy in jublife (if you have internet)
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.
There have never been any codes for any of the core Pokemon titles.
Spear Pillar is at the top of Mt. Coronet (Sky Pillar, where you catch Rayquaza in Pokemon Ruby, Sapphire, and Emerald, does not appear in Platinum).
You can find one on Map 9. Because i just found a plasma Rayquaza on 8/24/2010