Riku-son, this is a Sonic Adventure 2 Battle forum, not a Sonic Adventure DX forum, so try your luck there, or go to gamecube>S>Sonic Adventure DX>Action Replay codes from the front page and look there.
P.S. If you want a Tails chao, go on EBAY.COM and punch in Phantasy Star Online Episode One and Two. Buy it. Beat the mission: "The Fake in Yellow", its not hard, but DO NOT I repeat DO NOT GO BACK TO THE LOBBY!!!! go to a patch of grass across from a little stream near the exit and walk towards the horizon/waterfall. A Chao will tell you that you have found him and it's pretty hard to do that, so he will give you a gift. For this you need a Gameboy Advance/SP and a GCN/GBA link cable. Send the tails chao from the giant gameboy in the lobby (sort of like the ones in Sonic) to SA2B or SADX. The game is well worth it also. Trust me it's fun.
Ryanluigi0
P.S. Guess what time it is??
PEANUT BUTTA JELLY TIME!!!!! Your account is banned for the time bein' as you do not have the age of 13 yet and will have to provide us parental permission.
This is for your own safety.