If you're playing gen 3-6 (everything sandwiched between RS and their remakes), no. X Accuracy is only a 4/3 multiplier there, which is enough to bring a 70% move up to 93% but that's it.
In Sun/Moon and beyond, X items are 2-stage increases, so the multiplier is 5/3 and a move that was 70% becomes 117%, enough to stay perfect even if the opponent has Bright Powder.
Finally, in 1-2, X Accuracy didn't use the concept of "accuracy stages" (a sort of inverse Sand-Attack) at all. Rather, using just a single X Accuracy in those games was enough to make all your moves Swift% accurate until you switch, faint, or end the battle. This is why speedruns of RBY that actually bother to fight the Elite Four mostly use X Accuracy (and possibly X Speed) to set up Horn Drill and Fissure there.
