Wild Canyon
From Sonic Retro
Template:SA2Level Wild Canyon, the first level with Knuckles in Sonic Adventure 2, takes place in a dry canyon with a giant vent in the centre that blows air straight up. The goal, as with Sonic Adventure, is to find the three shards of the Master Emerald hidden in that level.
Big the Cat Location
At the beginning, ride the wind up to the max, then turn around fully and begin to glide that way. When Knuckles hit the wall, climb up and right, where you'll see Big hanging onto the wall, higher up.