What is covered in Champion Battle: Blue for Pokemon FireRed and LeafGreen?

After defeating the Elite Four, you'll discover that your rival, Blue, has already become the Champion! This is your final battle against him.

How do you complete Champion Battle: Blue in Pokemon FireRed and LeafGreen?

After defeating the Elite Four, you'll discover that your rival, Blue, has already become the Champion! This is your final battle against him.