Instructions
Insert the Action Replay device into the game slot on the top of the Nintendo DS or DSi handheld game console. Turn on the system and tap the "Action Replay" icon to launch the device.
Select the "Pokemon" game that you want to apply the code to from the Action Replay menu. The Action Replay Ultimate Codes for Pokemon device comes with codes for every Nintendo DS "Pokemon" game.
Scroll down to the "Pokemon" section of the code list. Press the "A" button to expand the section.
Place a checkmark next to the "Totodile," "Cyndaquil" and "Chikorita" codes. Tap the "Start" button when the codes are selected.
Remove the Action Replay device when prompted and insert the "Pokemon" game cartridge into the DS system. Select your save file to load the game. Totodile, Cyndaquil and Chikorita will now be in your party.