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It makes it way too easy to cheese people with the right setups. Piloting it is very flowcharty in a way that even stall/HO can't hope to match and beating it often boils down to having the right counters on your team before the game even starts (else you autolose). In older gens they decided to go with complex bans that nerf full BP without killing drypass and single boost passing, but in Gen 6 they spent half the gen trying to nerf it unsuccessfully so they banned it outright. Gen 7 even got it banned to AG because people were cheesing Ubers tourneys with Evoboost Pass among other things.
