Pokemon Diamond (DS)

Pokemon and Item Cloning:

Select the pokemon that you want to clone. Give it any items needed too. Put it in any of your boxes. Now, go to the GTS. Talk to the lady and enter. Put up a pokemon for trade (NOTE: Try this with a low-level pokemon who doesn't have an important item first). When it takes you to the loading screen, watch the little clock on the bottom-right part of the screen. Count how many times it hits the top, and note where it was when the pokemon was uploaded. Go back to the summary screen, and take out the pokemon. Once again, watch the clock. Most people's clock stops moving between 7.5 and 8 rotations.

Now, put the pokemon that you want to duplicate up for trade. Right before the clock gets to the interval where it changes, turn off the DS. Turn it back on, and load the game. You will probably get the error screen, but don't worry. Continue to load the game, and go back to the GTS. If you performed the glitch correctly, the pokemon will still be up for trade. Take it back, and leave. Now, go to the PC to the left of the counter. Load it up, and check your boxes. If you performed the glitch right, you will have duplicates of the pokemon (and possibly item) that you tried to clone.

If you didn't get it, try, try again. It took me about 13 times to get it. Just keep trying.

NOTE: This glitch is very risky. Several GameFAQs members have reported it to screw up their game. Several other members reported their pokemon being traded before they could get back to it. Though the number is very small (about 3/100 people), it still is a risk. Don't say you haven't been warned. To prevent the second problem from happening, request an evolved pokemon that is level 9 or lower (eg. Infernape).
(supplied by: forty-two)

Catching Cresselia:
After you beat the elite four, go to Canalave City and go in the house with a sign next to it. Talk to the boy in the bed, then talk to the woman. After you talk to the boy and woman exit the house and talk to the sailor that sails you to Iron island. He will ask you to go to Full Moon Island to get a wing to heal his son. Say yes to him. He will sail you there. Now walk up and to the left is the wing to heal his son get it. Dont leave yet, go to the right and then go up you will then see Cresselia go up to it and it runs away like Mesprit. Now go talk to the sailor and sail back to Canalave. When you get back you will follow him into his house and use the wing on his son. His son will then wake up and talk about a nightmare. You can now resume your adventure and look for Cresselia. You are going to need the pokemon marketing app to find Cresselia.
(supplied by: wwewwewwe)

Good Fishing rod:
The good rod is on route 209. Talk to a fisherman, say yes and he will give you a good rod.
(supplied by: connor.harbuck)

Mystery Gift:
This is how to obtain the Mystery Gift in Pokemon Diamond. It is different from the previous games, so pay attention.

1) Go to the Jubilife TV station, located in Jubilife City.
2) Go to the 3rd floor.
3) Talk to the man on the left in the lower room.
4) When he asks you to tell him some words, you tell himll him are "everyone" and "happy".
5) He will then ask you for a second set of words. Tell him "Wi-Fi" and "Connection". This will then unlock the Mystery Gift feature on the main menu.

When you go into it you can recieve your gift 3 ways:
-Friend
-Wireless
-Wi-fi While you won't get a gift from this cheat, just get the option to receive it, but when Pokemon/Gamefreak announces when the mystery event will be, go to "Wi-Fi" and ,if you are lucky, you might receive a mystery gift. This can include rare items, such as the ones needed to get to Arceus, Darkrai, and Shaymin.
(supplied by: Ho-Oh2224)

Fashion item:
When you are walking your pokemon in Amity Square, you can turn around and talk to your pokemon. Every 200 steps talk to your pokemon and it will be holding an item or an item for your fashion case.
(supplied by: #Pokepal#)

Old Pokemons
When you have another Pokemon game cartridge inserted into the GBA slot of your Nintendo DS, new Pokemon will appear AFTER YOU HAVE OBTAINED THE NATIONAL DEX. Below are the games that you can plug in, what Pokemon you will get, and where they will be. When you take the cartridge out, those unique Pokemon will disappear. These Pokemon appear in the wild and you must use the Pokeradar to find.

Ruby
Seedot Eterna Forest, Route 203, Route 204 Nuzleaf Route 229 Mawile Iron Island Zangoose Route 208 Solrock Lake Acuity, Lake Acuity Surroundings, Lake Verity, Lake Valor, Mt. Coronret, Spring Path, Turnback Cave

Sapphire
Lotad Route 203, 204, 205 North, 212 South Lombre Route 212 South, 229 Sableye Iron Island Seviper Route 208 Lunatone Lake Acuity, Lake Acuity Surroundings, Lake Verity, Lake Valor, Mt. Coronet, Spring Path, Turnback Cave

Emerald
Pineco Eterna Forest, Route 203, 204, 229 Gligar Hard Mountain, Route 206, 207, 214, 215, 227 Shuckle Route 224 Teddiursa Route 211, Lake Valor Ursaring Lake Valor, Route 216, 217

FireRed
Caterpie Route 204 South, Metapod Eterna Forest, Ekans Route 212 South, Arbok Great Marsh, Growlithe Route 201, 202, Elekid Route 204 South, Valley Windworks

LeafGreen
Weedle Route 204 South, Kakuna Eterna Forest, Sandshrew Lost Cave, Sandslash Route 228, Vulpix Route 209, Magby Hard Mountain, Route 227

Any Pokemon GBA Cartridge
Haunter Eterna Forest Mansion, Gengar Eterna Forest Mansion Room with eyes
(supplied by: Ho-Oh2224)

AR code:
This Action Replay code will give you Ho-oh and other pokemon on your party and will take all the pokemon party.

94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
e0000304 000000ec
e89de89f 03e20000
a5e362ce 67d33b19
7fa5774e 835854d1
5b540521 2687b708
846adc54 6e0869b9
fafdf703 47bdae4e
70065af8 fb2a5d8c
a3582893 4b351fb8
b6c9b475 86158ce8
b3db185c b8a363d9
a5b880af 9babf2eb
f75468a1 f44f4b86
45796235 620e7d8a
95ddce07 3eeb46a8
99f16265 d9906463
51f34f6b 3d90e222
a9c8f9bc e81cace8
02d07216 404fd68f
c415a64f 541cdb31
497c891f 7c4a2923
d4c1dc5f 74ebe0fa
f8f4237c e9baa13c
7c6bc4c1 eb261349
65f8fad8 a0b16277
a95f5a8f cc7a017e
2702f0de f4176216
f2de3d28 42a882de
16ba8bc1 7828777f
439c74b0 7a064f11
267f82b5 00000000
e00003f0 000000ec
1d031d05 a70b0000
5953317c 2e155b3b
baa687a5 10f23dc7
48ef343c 3697356f
a9531615 e6a130e0
ba0c686e ea0e3911
452068a3 04a8c956
3c190996 9628645e
0f31387f 278470d3
2230f743 eb0c6bc5
59d927f2 1086d7bd
6ed62d9e 397dafb5
af1ad1e0 7398b119
b7326704 066d9874
f42005ed 523df632
b01f4d79 00c76c08
ef8ff0af 1109f070
d6640409 fecdca48
38512fea f35e4c26
72704575 9dced665
a288fd53 bf72ecde
e515285d d2de7260
5f4fa9a4 ac8da0eb
146763c7 e209cada
4cf1cc1c e7e52823
a7fb038b 1af033dd
296199b9 28a75e03
d95f5e68 8aea1577
c967e51c 0af36e49
92349f02 00000000
e00004dc 000000ec
44fd44f9 6c7d00

Game ID: ADAE-636791c0
There are 153 codes for this game.

Max Cash (Press L+R)
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
000002e4 000f423f
d2000000 00000000

1 Hit Kill (Press Select in Battle)
Note: This code only work with random encounter Pokemons, not against a trainer with several pokemons.
94000130 000003fb
62106fc0 00000000
b2106fc0 00000000
1004868c 00000001
d2000000 00000000

Quick EXP Gain (Press R at the End of a Battle)
94000130 000002ff
62106fc0 00000000
b2106fc0 00000000
100458dc 00000500
d2000000 00000000

Items Bag Slot 1 (Press L+R)

Leftovers x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700ea
d2000000 00000000

Sun Stone x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e70050
d2000000 00000000

Moon Stone x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e70051
d2000000 00000000

Fire Stone x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e70052
d2000000 00000000

Thunder Stone x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e70053
d2000000 00000000

Water Stone x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e70054
d2000000 00000000

Leaf Stone x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e70055
d2000000 00000000

Light Stone x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e7006b
d2000000 00000000

Dark Stone x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e7006c
d2000000 00000000

Awakening Stone x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e7006d
d2000000 00000000

Round Stone x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e7006e
d2000000 00000000

Cracked Stone x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e7006f
d2000000 00000000

Ever Stone x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700e5
d2000000 00000000

Root Fossil x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e70063
d2000000 00000000

Claw Fossil x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e70064
d2000000 00000000

Helix Fossil x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e70065
d2000000 00000000

Dome Fossil x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e70066
d2000000 00000000

Old Amber x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e70067
d2000000 00000000

Helmet Fossil x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e70068
d2000000 00000000

Shield Fossil x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e70069
d2000000 00000000

Heart Scale x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e7005d
d2000000 00000000

Exp Share x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700d8
d2000000 00000000

Bright Powder x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700d5
d2000000 00000000

White Herb x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700d6
d2000000 00000000

Macho Brace x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700d7
d2000000 00000000

Quick Claw x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700d9
d2000000 00000000

Soothe Bell x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700da
d2000000 00000000

Mental Herb x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700db
d2000000 00000000

Choice Band x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700dc
d2000000 00000000

Kings Rock x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700dd
d2000000 00000000

Silver Powder x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700de
d2000000 00000000

Amulet Coin x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700df
d2000000 00000000

Cleanse Tag x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700e0
d2000000 00000000

Soul Dew x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700e1
d2000000 00000000

Deep Sea Tooth x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700e2
d2000000 00000000

Deep Sea Scale x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700e3
d2000000 00000000

Smoke Ball x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700e4
d2000000 00000000

Focus Band x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700e6
d2000000 00000000

Lucky Egg x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700e7
d2000000 00000000

Scope Lens x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700e8
d2000000 00000000

Metal Coat x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700e9
d2000000 00000000

Dragon Scale x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700eb
d2000000 00000000

Light Ball x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700ec
d2000000 00000000

Soft Sand x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700ed
d2000000 00000000

Hard Stone x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700ee
d2000000 00000000

Miracle Seed x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700ef
d2000000 00000000

Black Glasses x999
94000130 fcff0000
b21c4d28 00000000
b0000004 00000000
00000890 03e700f0
d2000000 00000000

Black Belt x999
94000130 fcff0000
b21c4d28 000000