Hey i am glad to see you have taken into account some of my suggestions! i think ferrothorn is a reall bitch. but if you manage to get a free switch into sableye you can taunt it then give it a burn to gradually reduce its hp and weaken its gyro ball/ powere whip. if ferrothorns are really a big pain in the arse youcould run liqiud ooze on tentacruel to help against leech seed variants althoug you probally like rain dish better but hey its still a choice! if you want you could try hidden power fire over sludge wave on tentacruel it still lets you hit grass types well but also steels! and is somewhat unpredictable! also youcould always go for knock off to get rid of Ferros lefties
i hope i helped again because hail is so damn sick we need more good hail teams!
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