It's in Sky Rail. Go though the Level like you normally would until you get to the first rocket. Don't take this rocket, instead, use your Homing Attack on the enemy over to the ledge with the Chao Box. Get as close to the edge as you can and a row of bad guys'll appear. Use your Homing Attack again on these guys to get to the top of the mountain and take the Upgrade!
[center]HERE TO ANSWER YOUR GAMING QUESTIONS & HELP YOU BEAT THOSE GAMES!
[color=red][b]2,000+ POINTS & ALWAYS GROWING!!![/color]
I FINALLY GOT MY WII & WII LOVE IT!!!!![/b][/center]