Z moves and megas were horrible ingame, one powering your mon up to the point of the already scrubby opponents not having any chance of beating it and the other giving you a free nuke every battle, which is even worse when every trainer in the region has 2 or 1 mon only. I also agree that the jump to 3d was a huge flop, i would say it was even worse than sonic's jump to 3D. Powercreep and legendaries only affect competitive so i won't talk about it. I don't see many reasons for the battle frontier to return tbh, it is just battle spot singles with some gimmicks, im definitively not going to miss it if it never comes back, hell,i would prefer the contests over it lmao.Z moves, megas, the transition to 3d, power creep, many legends every generation, the absence of battle frontier etc has set this series in a downward spiral. I thank the skies every day for gen's III-V.