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There is an area near the beginning of Route 8 with an item on a ledge you can hop down from. It is possible to hop down from here into a tree and get completely stuck.
Ran into an issue with the move copycat. If a pokemon uses copycat and the last move used was also copycat then it will endlessly use copycat softlocking the game. Happened on route 5 when I was trying to catch a Happiny.