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>Lower accuracy
>Use Stun Spore or Sleep
>Pray to RNG Jesus
If Miltank misses once using Rollout, the damage resets back to the base damage. Same theory with Stun Spore; if you Paralyze Miltank and it is unable to move on its turn, the damage will reset
Just remember, she's one of the most bullshit gym leaders in the game. Once you beat her, the rest of the game can seem easy as long as you keep your team leveled