This game is also available on GBA.
Retro Game Cheats for Pokemon Mystery Dungeon: Red Rescue Team (Nintendo DS)
Effect: Unlock Buried Relic dungeons
When:
After beating game
How:
Clear Stormy Sea, read newsletter, go to Pokemon square then talk to Lombre then to Shiftry for access.
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Effect: Unlock Northern Range dungeons
When:
After beating game
How:
Purchase friend area "Southern Island" and have/get HM Surf. After that do a mission or dungeon to trigger event.
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Effect: Unlock Desert Region dungeons
When:
After beating game
How:
After you beat the game and the credits roll, they're unlocked.
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Effect: Unlock Fiery Field (entai) dungeons
When:
After beating game
How:
Obtain Hm Surf from the Solar Cave. Spinda will then visit and tell you about a mirage Pokemon. You can now go to Fiery Field.
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Effect: Unlock Waterfall Pond dungeons
Effect: Unlock Northwind Field (suicune) dungeons
Effect: Unlock Stormy Sea dungeons
When:
After beating game
How:
Talk to Medicham, he will be near your HQ, then talk to Lombre in Pokemon Square, after that talk to Wishcash to get HM Dive and access to dungeon.
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Effect: Unlock Mount Faraway (Ho-Oh) dungeons
Effect: Unlock Pitfall Valley dungeons
Effect: Unlock Lightning Field (Raikou) dungeons