You need to beat Winona, the gum leader in Fortree City. I suggest using Lairon and Magneton on this gym. Use spark and thunderbolt with Magneton and get rollout from the fat guy in mauville city next to the gym hope it works!
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To use the HM Fly, you have to have the Thunder Badge, won from Lt. Surge in Vermilion City.
Swelleow can. Pelliper can. Swablu can. Altaria can.
No, I don't think so.
The Thunder Badge
fly in the middle of the room