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It was a pretty thinly veiled attempt to disguise it, too. Do the puzzle, beat the sub-bosses, beat the boss, get a reward, progress. Just because you weren't in a building and you were battling Pokemon directly instead of trainers does not make everything suddenly different...or, in gameplay terms, anything different. I'm not saying Island Trials were bad - I have plenty of other things in SM to pick holes in - but I am saying that they didn't change a single thing.