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Then there's the problem of hail. The scourge of gen 5 caves is here to solve it for us.
At level 33, Roggenrola learns sandstorm. Since Donphan is a ground type, it's immune to sandstorm. This also means we don't always have to use a turn attacking with priority, since the sandstorm kills the endeavored Pokemon for us. One Turn Rock's purpose is still mainly to get rid of the hail by replacing it with sandstorm, though. For better effect, I managed to dig up a smooth rock to increase sandstorm's duration.
Bottom right is the team we must use to fight both Neved and Madame X right after. Fortunately, since Neved is a tag fight, we are healed immediately after. We must put the Rock in front, and must not let both Gaga and Fran die. The Donphans cannot be allowed out until the are ready sot they don't gain xp or use their items.