Sounds exciting! Good luck! I'm just at 126 with the Stoutland-Tentacruel-Dragonite team. Boy, Tentacruel sure makes battles slow (especially when compared to Volcarona). And I did end up going for Rest > Acid Spray, ever since 84 actually. Ironically, Rest has never been used even once yet, while there have been about 4 times where Tentacruel was fully set up facing a Water immune pokemon (Vaporeon, Lapras, Toxicroak, Poliwrath). Other than Lapras (which I PP-stalled til struggle), I actually just PP-stalled out of the essential attacking PPs and then switch to Dragonite to set up. But yah, those battles take so long. Rest does make more sense though. I can't imagine losing because of having rest instead of acid spray. Of course I could use another move entirely too... but... nah.