Things You'll Need
Instructions
Place the "Pokemon HeartGold" cartridge into the Action Replay.
Place the Action Replay into the Nintendo DS cartridge slot.
Turn on the DS.
Select "Codes" from the main menu.
Select "Add new code." Type in the code to get Turtwig:
52247d8c 582000c0
12247d8a 00004801
02247d8c e0021c39
02247d90 00000183
d2000000 00000000
The code for Grotle is:
52247d8c 582000c0
12247d8a 00004801
02247d8c e0021c39
02247d90 00000184
d2000000 00000000
Select "Start" or double-tap "Continue," then "Yes" to proceed.
Select "Codes" again on the main menu to activate the new codes. Find the new codes on the list and press "A" to activate them. Turtwig and Grotle will be added to your Pokemon party.