This week, the gang visits Johto's (and later Shinou's) Battle Frontier, where Ash and Misty help Brock complete his Lore Stage rainbow!

This episode underwent a dramatic transformation, and worked very well even after I removed Team Rocket--originally, it was going to be a true amusement park, instead of a massive Team Rocket trap. But then, I remembered that in HG/SS, Johto gets a Battle Frontier. When I saw that none of the other Shinou Frontier Brains ever made an appearance in...