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It's interesting to see how the anime adapts the different Battle Frontier challenges. Well, it would've been if they had. They kind of alluded to Noland having "rental" Pokemon including Articuno, but Greta and the Battle Arena was basically just a straight up match with a random number of party members. It's a shame, because the Arena's gimmick (battles in rounds, with scoring based on offense, defense and HP) would've been pretty simple and different from the norm. I'll be very disappointed when the Battle Pyramid and the Battle Pike aren't actual dungeons.