That random Fisherman? His Goldeen has Megahorn . That Bug Catcher? His Beedrill has Drill Run . Drayano specifically edits movesets to punish type-locked teams. Never, ever switch in a Grass type on a Water type thinking it’s safe. Always scout with a bulky "sacrificial lamb" or a Protect user first.
take the Hoenn starter gift in the same town if you count gifts as area encounters. Take the Keystone to the Slowpoke Well