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Gym 3, 4, or 5, in spite of providing such a potentially broken TM. Gym itself would be based on a zen garden and you have to walk through it slowly without disturbing any of the plants or water, or else you'll be challenged to a battle by a trainer. There is a specific path to take that lets you avoid battling at all, but it is very long given you can't run at all during it- and besides, why would you skip out on free EXP? It's a GRASS gym, for crying out loud, you should have a Flying type that knows Peck or Gust at the least by now!