There is no other one, unfortunetly. If you are writing this question because upokecenter was currently down (which it was) it's now back up!
upokecenter is the original site of the Wondermail/SOS mail generator. Use this for generating wonder mail codes: http://www.upokecenter.com/games/dungeon2/guides/wondermail.php Use this to rescue yourself if you've died in a dungeon: http://www.upokecenter.com/games/dungeon2/guides/sosmail.php A copy of the Wondermail/SOS generator can be found at http://adamhaskell.net/misc/wondermail/ or http://www.robcoconsulting.com/eotwondermail.html
there cheats technacly
You cannot get it in this game, only in Explorers of.
As far as I know, there isn't one. I cant make one on the Wondermail generator, anyway. You have to beat the game and buy it from Wigglytuff.
They r like cheats u can find all over the Internet to give u exciting items that u need or twists in the game to make it more interesting. To make ur own wondermail, go to upokecenter.com and look for the wondermail generator.
it's acuaually only on Pokemon mystery dungeon darkness/time and mabye sky
You can find them commonly in Sky Stairs. You need to get the wondermail code for it.
You can either get one from a wondermail (Just google it to find a generator) or if your lucky, find it in the Kelecon Bother's shop or in the special cave (The name of which I don't remember right now, its where you first use keys).
You need to get a wondermail code for it as its only in red rescue and u can find a code in gamefaqs.com or any other wondermail website.
The wondermail only allows input of certain letters.
The water mail
If you are defeated in a dungeon, you can request a friend rescue, this gives you a wondermail code. Someone else can enter the wondermail code into their game, and it will set up the same scenario you were on, with a flag at the place you were defeated. If they reach that flag, then your team is rescued. You can then generate a thank you code to reward them.