Board Thread:Anime/Game Discussion/@comment-34882417-20190706120552/@comment-40261920-20191206065341

GER's ability isn't that he controls fate, it's just that he resets any action to a point where it never occured, the infinite death loop is created by Diavolo's death being reset every time it occurs. Tusk doesn't defy fate, it controls gravity, which wouldn't help defend against GER. And yeah GER couldn't break Love Train, but it could certainly destroy Valentine and D4C, even if Love Train is active.

Nothing in canon will ever be able to beat GER, because any action that tries to affect it will be reset back to zero, and all attempts to beat GER will include an action at somepoint. Death 13 definitely can't beat it since "pulling someone into the dream world" is an action that can be undone, and GER, being a sentient stand, will do so automatically.