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Another at the end here. Once I have all badges and HMs so access to stuff isn't a problem but right before going to the E4, I go back to the beginning and go through the map again to pick all trainers/items/areas/etc that I couldn't access before. Obviously if something is for Champions only I keep it in mind for later. Stuff like the stickers or Zygarde parts I leave them for postgame tho.
