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TMs locked behind Surf:
>Psyshock
>Dream Eater
>Bulldoze
>Dragon Tail
and plenty of bullshit like this. you don't get an itemfinder in this game, so he's free to just put hidden items on the most random tiles imaginable instead of having to hide them smartly like in urmumium/madame moto (this one is also past a rock you have to awkwardly noclip through)