THIS DAT IS AVAILABLE EXCLUSIVELY THROUGH GBAtemp.net.
If you got it anywhere else, it may not be as up to date as it should be.

The NEW massive CHEAT compilation thread
Maintained by Narin
http://gbatemp.net/index.php?showtopic=84991

GBAtemp Cheat Page
http://cheats.gbatemp.net
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SPECIAL RECOGNITION:

..
10nayr
AceAttorney
AceOfAces
Aeladya
AmienZero
anandjones
Antoligy
aquata232 
AshenREAPER
AsPika2219
badz
Baka_Kyuubi84
BaldyMcBald
Banana-kun
basher11
BenJa - KuMo
bfoos
bond697
Broomop
Buleste
BurlyEd
caiboss
CaitSith2
cha0s22
Chaosruler
Chase-san
chishm (For his awesome backlight codes, plus any other codes in the dat which he created)
CodeBot
conanac
connor_walsh95
cory1492
Cracker (for the excellent code to disable the "Thanks for Playing" nag screen in FFCC (U))
Crackerhead22
Creqaw
Curley
darkspirit456
DarthNemesis
DBZGT_Son_Gokuu
Demonic
Deozaan
deundead
DLONG
drwhojan
DS_GOD
dsrules
Dualscreenman
ekmo
elixirdream
EpicPie
Exwhyzee
fa_demion (Holger) For the great many cheats for many German and European released games.
Fabrice F
Falzar FZ
faospark
FaxedOut
Feran
FireHawkX
FNG
Full Metal Kirby
gardevor
gekka_no_kenshi
Goldenrodcity
grant
grizz96
Groovy93
Groovy Ayu
hackerzg6
Hehe Moo
Helder
hexic
Hiei-YYH (most prolific code hacker I've seen)
Note: Hiei-YYH has given the Massive Cheat Database and CMX exclusive permission to distribute his cheats.
hybrid
i am r4ymond
imaria
inny
Jason
jleemero
John2022
Joshob1987
KazoWAR
Keitaro Urashima
kenobi (he created the ASM to AR coding)
kenshinkon
King Rhyono
koby
Kodoku
Kurt_Lang
ladypoodle
Lassik
lol
macrox
MADGENIUS_Hojo
marsh
Mastermind_X
mbruno
Medusa
mega rock.exe
MEGrika
meru_uma
MF Tlaxcala
Miles Tailes Prower
Minion
Missing Number
mrfatso
M@T
Narin
NazoXIII
NDS-Boy
neoimportaku
Nigoli
nintenboy
nIxx
Normmatt
omarrrio
Parasyte
pharao
PhoenixA1
polle123
pongozila
popochan
Prof. 9
Pulse
r9delta
Radical Hacker
Raika
raing3
retroben
RetroGameFan (mastermind behind the DSTT update and known for fixing E/U releases)
Rockman
Rockman GFF
Roy Nimbus (Josuke Midori)
Rune
Ryouma
sandu
SCV
Sereniry Frost
Serving
ShinyPalkia (now he's named Waschbecken)
SignZ
Silent Storm
skiller
Smokey911
someonewhodied
Sotho Tal Ker
sunakochan
SuzieJoeBob
tasperfect
Tazgirl18992
Thainin
The Keeganator
Timbu
Timiti7
toenailed (he made the button hack codes for Zelda)
Twiffles
twiztidsinz
Under.Exe
Vague Rant
Viper187
viperver1
Virus
Vistabuser
vv2006
Xmortal
xplicitwarz
xxazndragonxx
yab
Zarcon
Zeld

Also a round of thanks to everyone else who contributed to the cheat database in one form or another!
If you see your cheats or made significant contributions to the cheat database, please let me know so I can add you to the list.

-------NOTE-------
Most of the cheats contained in the cheat compilation database were gathered from various places from around the net or submitted by members of GBATemp. Credits for all the cheats in the dat belong to the hackers who created them. If your codes are included within the dat and your name isn't in the credits, please contact me so I can make the correction.

The program used to maintain the database is R4CCE. This program was created by Yasu Software and is what makes it possible to maintain this database for all of you.
-------NOTE-------

All codes were provided in the spirit of gaming. These are provided mainly for people who can't (or won't) compile their own dat for their games on their flashcarts, or to be used as all "all-in-one" reference for your own custom cheat dat.


Codes are NOT guaranteed to work. Codes are "as is", some just don't function, some conflict with other codes (watch out for that). Use the ones that work for you. The fact that the codes are running on a flashcart may be why some don't work as they should....or at all. I leave Some non-working codes in, hoping that maybe a future update from the R4DS team will fix them.

KUDOS go out to all the people who created all the cheat codes! While I can't name EVERY hacker out there, here is a list of most of the sites from which this dat was compiled.

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This cheat databases SHOULD work for R4DS, M3 Simply/Real, G6DS Real, DS TopToy, Acekard RPG/2, Supercard, CycloDS, EDGE, EZFlash and others as well as all their clones.
Some cards these dat files work with:
R4DS
N5DS
M3 Simply
Acekard 2/ RPG
CHEAT.DAT (Encrypted)

R4DS
N5DS
M3 Simply
DS Top Toy
USRCHEAT.DAT (Unencrypted)

M3DS Real
G6 Real
cheat.db

Supercard
Acekard 2/ RPG
G6 Real
cheat.xml (Unencrypted)

CycloDS
user.EVOcheats

EDGE
EDGEcheat.dat (You must rename it to the proper name for EDGE cards)

To R4DS Users:
To R4 users and its clones, use either CHEAT.dat or USRCHEAT.dat and not both, using both will cause some codes and games not to show up.

For those having problems with some games not showing up like Yu-Gi-Oh its due to a bug/limit in your flashcart (R4, M3 Simply, ect) and you have a few options.
Plese check out this notice for more information on how to fix this problem:
http://cheats.gbatemp.net/#notice

The R4DS contains a flaw that prevents some cheats from working on it. Though luckily there is a fix! Thanks to Yasu, the creator of R4CCE, there is a patch for the R4DS kernel that makes the cheats work. The program is called r4bugfix2 and you can get it on Yasu's English software page. Its easy enough to use, all you have to do is simply drop your _DS_MENU.DAT file from the R4 kernel on the r4bugfix.exe program. and it will patch it. Alternately, you can copy the file to the same folder as the r4bugfix file and click the execute. Afterwards, place the patched _DS_MENU.DAT file on your flashcart. Also, as with updating your firmware, I suggest deleting the _DS_MENU.SYS file and allow the R4DS to recreate it to prevent problems.

You can find the pre-patched _DS_MENU.DAT file here for the R4DS kernel.
http://gbatemp.net/index.php?download=2384

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http://www.codejunkies.com
http://www.cmgsccc.com
http://www.gscentral.org
http://www.kodewerx.net
http://www.thegshi.org
http://www.codemasters-project.net
http://www.arcentral.net
http://www.bsfree.org
http://nintendohack.c.la
http://spieletipps.de
http://www.neoseeker.com/Games/action_replay

Most of these sites are in one way or another affiliated. Or at the very least, share members (including hackers). I'm 100% positive that I have missed many many sites. Some sites are not listed because they also have ROMs, which is illegal. Some sites may not want their name mentioned. So they aren't.

-------------- Start: Borrowed From http://nds-help.com --------------
Tutorial: How to Put Cheats on Your Slot 1 Card

R4DS/M3DS Simply/N5DS Cheat Tutorial
(1) The R4DS uses the cheat.dat and usrcheat.dat files. Use only one of these files, not both as using both can cause some cheats not to show up.
(2) After downloading the cheat.dat and usrcheat.dat files from the links provided, use WinRar/WinZip/7-Zip to extract the files.
(3) Copy the extracted files.
(4) Go to your SD card and paste the files in the _system_?folder.
(5) If prompted to replace an older cheat file, click yes?to proceed and overwrite the old cheat database.

M3DS Real/G6DS Real Cheat Tutorial
(1) The M3/G6 DS Real uses the cheat.db file.
(2) After downloading the cheat.db file from the link provided, use WinRar/WinZip/7-Zip to extract the file.
(3) Copy the extracted file.
(4) Go to your SD card and paste the file in the SYSTEM?folder.
(5) If prompted to replace an older cheat file, click yes?to proceed and overwrite the old cheat database.

Acekard 2 RPG Cheat Tutorial
(1) The AceKard 2 RPG uses the cheat.dat and cheat.xml files.
(2) After downloading the cheat.dat and cheat.xml files from the link provided, use WinRar/WinZip/7-Zip to extract the files.
(3) Copy the extracted files.
(4) Go to your SD card, click your __ak2? folder, cheats?and replace your cheat files there.
(5) If prompted to replace an older cheat file, click yes?to proceed and overwrite the old cheat database.
(6) Load up the AceKard 2 and go to the game you want to cheat with. Open up the cheat window.
(7) Click DB select? Choose either cheat database.
(8) Press rebuild?and a cheat file for the game will be created.

iTouch DS Cheat Tutorial (courtesy of Digitap)
(1) The iTouch DS uses the cheat.db file.
(2) After downloading the cheat.db file from the link provided, use WinRar/WinZip/7-Zip to extract the files.
(3) Copy the extracted file.
(4) Go to your SD card and paste the file in the iTouch?folder.
(5) If prompted to replace an older cheat file, click yes?to proceed and overwrite the old cheat database.

CycloDS Cheat Tutorial
(1) The CycloDS uses the user.evoCheats file.
(2) After downloading the user.evoCheats file from the link provided, use WinRar/WinZip/7-Zip to extract the file.
(3) Copy the extracted file.
(4) Go to your SD card and paste the file in the CycloDS?folder.
(5) If prompted to replace an older cheat file, click yes?to proceed and overwrite the old cheat database.

EDGE Cheat Tutorial
(1) The EDGE uses the EDGEcheats.dat file.
(2) After downloading the EDGEcheats.dat file from the link provided, use WinRar/WinZip/7-Zip to extract the file.
(3) Copy the extracted file.
(4) Go to your SD card and paste the file in the EDGE?folder.
(5) If prompted to replace an older cheat file, click yes?to proceed and overwrite the old cheat database.

DS Top Toy (DSTT) Cheat Tutorial
(1) The DSTT uses the usrcheat.dat file.
(2) After downloading the usrcheat.dat file from the link provided, use WinRar/WinZip/7-Zip to extract the file.
(3) Copy the extracted file.
(4) Go to your SD card and paste the file in the TTMENU?folder.
(5) If prompted to replace an older cheat file, click yes?to proceed and overwrite the old cheat database.
-------------- End: Borrowed From http://nds-help.com --------------

Cheat your way to glory and power!


NOTE:
Please be responsible when using these cheats. Some can be devastating to online play and really create an unfair and "no-fun" environment online. This dat was created to be fun and to help people get through games they may be stuck in, not to dominate online rankings. If you're going to cheat online, do it only with buddies who all have the same codes. Don't use them maliciously against unsuspecting online gamers as that ruins the online experience for everyone.