Just started building and looking at teams, but this is by far my favourite as of right now.
Special M-Abomasnow is the best set imo, FB > EQ for sure and Ice Shard is nice to pick off stuff. Diancie has nice synergy as it's an answer to most flying and fire types, it used to have an offensive set with Shuca but I found it getting KO'd too early so I changed it to Z Heal Bell, not the best set but it works on this team for me. Togedemaru was the only steel type I could see fitting, with volt immunity + tanking most hits from Heliolisk, taking on Ice Cream, Vikavolt, Whimsicott and some other grass types along with Wish support + U-turn and Protect scouting. I chose Zing Zap > Iron Head because I found hitting Xatu/other flying types, steels like Klinklang, bulky waters etc. was more useful. Golbat is a great fighting + grass resist, TauntTox annoys alot of teams. Blastoise is still my favourite hazard control despite the ghost/grass types and Torterra still being decent. Passimian is Passimian and I don't want this to be too long :P