• Cheat mode
  While playing the game, press Up to display Niko’s cell phone. Press Up again to access the keypad. Then, enter one of the following codes to activate the corresponding cheat function. Once a code has been entered correctly, a new “Cheats” menu option will be available on your phone, below “Options”, where you can access the cheats without having to enter the phone number again. Note: Do not save the game after enabling a code to avoid unforeseen problems. You can usually only spawn one vehicle at a time. Any previously spawned vehicles will disappear. However, if you spawn a vehicle, save the game, and load again, you can spawn another one and your original will not disappear. You must have it in your parking space in front of a safehouse or it will be gone before you have a chance to spawn another.
• Full health and armor
  Dial “3625550100″ on the cell phone. If you enter this code while in a vehicle, it will also repair it. Note: This phone number translates to “DOC-555-0100″.
• Full health, armor, and ammunition
  Dial “4825550100″ on the cell phone. If you enter this code while in a vehicle, it will also repair it. Note: This phone number translates to “GTA-555-0100″.
• Weapons tier 1 (more…)

• High Definition mode
  Before the “Sony Computer Entertainment Presents” screen appears, hold L1 + L2 + L3 + Square + Circle. If you entered the code correctly, the letters on that screen will turn purple. -From: Larry Solinger
• Challenge Of The Titans mode
  Successfully complete the game to unlock the Challenge Of The Titans mode.
• Arena Of The Fates mode
  Get a “Titan” rank in Challenge mode to unlock the Arena Of The Fates mode.
• Titan mode
  Successfully complete the game to unlock the Titan difficulty setting.
• Alternate costumes (more…)

Note: This game is also titled Pocket Monsters Pearl.

National Dex
Defeat the Elite Four to get the National Dex from Professor Oak. Alternately, successfully complete your Sinnoh Pokedex by seeing all 150 Sinnoh region Pokemon. Note: They do not have to be captured. Then, go to Professor Rowan’s lab and talk to him. Prof Oak will dash in and upgrade it.

Pal Park
Get the National Dex to access Pal Park on Route 221.

Agunomu
Go to Aspiration Lake to catch Agunomu.

Ambipom
Aipom will evolve into Ambipom when it levels up and knows the move Double Hit. Aipom learns Double Hit at level 32. (more…)

Note: This game is also titled Pocket Monsters Diamond.

National Dex
Defeat the Elite Four to get the National Dex from Professor Oak. Alternately, successfully complete your Sinnoh Pokedex by seeing all 150 Sinnoh region Pokemon. Note: They do not have to be captured. Then, go to Professor Rowan’s lab and talk to him. Prof Oak will dash in and upgrade it.

Pal Park
Get the National Dex to access Pal Park on Route 221.

Agunomu
Go to Aspiration Lake to catch Agunomu. (more…)