The password depends on who needs your help. Look online and you can find S.O.S passwords. There is a particular site on which you can learn to create your own A-OK Passwords in case no-one takes your SOS. It is quite good, but you may need a little help in understanding it - three lines of specific characters does get confusing!
pokmeon322166885poshegdvsvcs
An a-ok mail in mystery dungeon is a message that tells the person who requested a rescue that the are back in the dungeon they were in before.
skjdflasjkdfkla;sjfkl;sdjgioawerjfsdoifa
because the only wonder mail codes that are real have those letters
wonder mail
pokmeon322166885poshegdvsvcs
An a-ok mail in mystery dungeon is a message that tells the person who requested a rescue that the are back in the dungeon they were in before.
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
After you beat Rayquaza, the next day it comes!
skjdflasjkdfkla;sjfkl;sdjgioawerjfsdoifa
i don't have the red version but i know they can
in the same menu where is continue , delete save data ' adventure log , friend rescue , trade items , and then is wonder mail
Beat stormy sea and keep checking mail then talk to shiftry
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.
You have to be defeated in a dungeon.