Big the Cat Appearances
There are several places in SA2 that you can see Big the Cat from Sonic Adventure. Here are a few of them:
1. City Escape: About 3/4 of the way down when you're running away from the truck look on the right sidewalk to see him running away.
2. Radical Highway: After going in one of the rockets look at the blimp to the left and he will be sitting on it.
3. Pumpkin Hill: Go to the area where the train is stuck (it's going back and forth) and he is behind one of the gates waving to you.
4. Cannon's Core: With Rouge, go to the top of the highest pillar in the main room and look up. He's jumping up and down.
5. When you're battling against Shadow with Sonic in the Green Forest area there is a grate. Look down in the grate and you can see Big fishing.