Forget about Flail, this move is bad.
Mixed Palkia is pretty good with Hasty because it prefer to keep its special bulk in order tank special hits which are more common in Ubers.
Infernape may have some uses with a Hasty nature but prefers being Naive for sponging priorities better. It still works, though
As said, Flail is not very impressive. Reversal is not much better but at least comes with a better coverage. Lucario is suitable for this, because of the immunity to sandstorm.
Mixed Palkia is pretty good with Hasty because it prefer to keep its special bulk in order tank special hits which are more common in Ubers.
Infernape may have some uses with a Hasty nature but prefers being Naive for sponging priorities better. It still works, though
As said, Flail is not very impressive. Reversal is not much better but at least comes with a better coverage. Lucario is suitable for this, because of the immunity to sandstorm.