@Chessmaster56: Other than what others said, another option to be considered is using a Ghost type (Jellicent and Chandelure have spread moves as well, and Sableye can fake out/wow/sucker punch), which is immune to Endeavor. Using a ghost means Aron can't do anything to it, making predictions easier.
If Aron is really that annoying or hard to deal with for whatever reason, Chandelure also learns Flame Burst, which damages its target's partner regardless of protect, meaning that Chandelure can break Aron's sash even if Aron is using protect, as long as Aron's partner isn't. The good thing about this option is that the damage (1/16th HP) from Flame Burst will not activate berry juice, meaning that Sturdy wiil be broken right away instead of Berry Juice bringing Aron back to full health to reactivate Sturdy. That is most likely not necessary though, since Heat Wave is much more useful in most situations.
Also, you mentioned hail twice. :)