Can confirm is excellent $$$
Azumarill (M) @ Leftovers
Ability: Sap Sipper
EVs: 248 HP / 8 Def / 252 SpD
IVs: 0 Atk
- Sleep Talk
This set may appear gimmicky at first, but it is actually quite effective in practice. With Sap Sipper, Resttalk, and full spdef, Azu can easily wall Keldeo, both Zards, Weavile, Serperior, Breloom, Gyarados, and more. The amount of role compression in terms of checking different pokemon is huge for so many teams and is a great reason to use this Azu set. A common partner of preference could be Ferrothorn, which has great defensive synergy with Azu both on paper and in practice.
As far as success goes, a friend and I have used this set to get to top 10 on ladder multiple times. Give it a try and it'll definitely exceed your expectations.
If replays are needed i have plenty in my RMT.