Oscarus

Stakataka's x4 weaknesses made their presence fell to me... in a hard way. 

So, I decided to replace it with Celesteela - another bulky and offensive Ultra Beast.

Yes, I've said that I hate that UB... but the effectiveness and wide coverage can't be denied. Honestly, I've had the trouble with deciding whether should I use psyhical or special side of offense (as Celesteela's Attack and Special Attack are almost equal). Ultimately, I decided for special side, with seemingly better coverage for my tastes (and Giga Drain being able to heal it) 

And it helped me a few times - easily tanking Rain-boosted Ludicolo's Hydro Vortex (from Hydro Pump). 

Now, that team has a 15-3 record (Win Rate of 83,3%, which isn't that good, but for now it can be)