I'm not sure if there's a Wonder Mail for it, but if you're looking for it, you can find it the Wyvern Hill, at around 29F (I think).
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Just go to UPokeCenter.com and find the wonder mail generator. for red and blue it is regular mystery dungeon, for darkness, time, and sky it's mystery dungeon 2
upokecent.com
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WONDER MAIL IS JUST THE ONLY CHEATS THAT WOULD BE HELPFUL IF YOU WANT MORE WORK TO DO.
in the same menu where is continue , delete save data ' adventure log , friend rescue , trade items , and then is wonder mail
The wondermail only allows input of certain letters.
There is no wonder mail for Dialga. There is no code that will make it a client, rescue target, special mission challenger, etc.
because the only wonder mail codes that are real have those letters
i don't have the red version but i know they can
Just go to google and look up wonder mail codes
No dudes. No codes for that. As far as i know.