Rock Climbing
Ok, I just found this out a few days ago. Go into the normal chao garden with sonic or shadow. Go over to the pool and stand infront of it. Go to the rock wall on the opposite side of the pool. Jump and do a homing attack on certain spots of the wall. Keep doing that and you will stay on the angled parts of the wall for as long as you want. If you stop homing then you will fall. I have tested it extensively and it does work.
More tricks, tips and cheats for this game are right here - Sonic Adventure 2 Battle cheats
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