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No,you cannot.The truth is,that Knuckles Chao never existed in the U.S.A version of Sonic Adventure 2 Battle.They only existed in Tokyo,Japan.BUT,the only way you can obtain a Knuckles Chao in SA2B is via hacking.
You don't. In 2003 there was a give away in Japan where if you brought your memory card, Sega representatives would put a Tails Chao (also obtainable through the Fake in Yellow quest on PSO Eps 1 and 2), a Knuckles Chao, and an Amy Chao onto your memory card. All 3 are immortal and animals do not affect them whatsoever. So Action Replay and/or Gameshark are the only ways to get the Knuckles and Amy Chao. Tails Chao can be gotten in the afformentioned quest in Phantasy Star Online Episodes 1 and 2, which is about 40 dollars used on Amazon.
Tails Chao- HQ1G-0TA8-TKE57 UUH7-P89F-K2602 GEYW-WF0N-UTYBQ Knuckles Chao- MN2A-GD16-A8KMP UUH7-P89F-K2602 PZR0-8Z4H-41CX1 Amy Chao- JHCA-GC3M-VKZTR UUH7-P89F-K2602 D9B4-H1NR-WWK4K 2-Player Chao Garden- T578-G6ZX-X08W8 Q95B-WV0J-10V85 TBYE-9V2D-6TANB (Activate by holding D-pad up when selecting 2-P Stage. CAUTION!!! Don't attack each other or the game will freeze!)
Use action replay
Its a hack or a cheat that lets you.