User blog comment:Mewkat14/Spritalicous Volume 10: For Mobius' Sake/@comment-3551372-20120326122601/@comment-25685240-20120326155253

Tails chao, Amy chao, Sonic chao, and Knuckles chao are also in Sonic Advance 3. You could have gotten Tails chao in Sonic Adventure without hacking.