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Go the emergent route
>HM overworld access is still gated by badges
>Various moves can fill the role of a given HM
>Moves may execute an HM technique in a unique way, perhaps revolving around BP with some exceptions
>E.g. Scratch, Cut (now e.g. a steel move), and Slash cut trees at varying rates (can be used in puzzles)
>E.g. Aqua Jet is an unruly version of Surf