I highly reccomend using florges as a giant spdef tank. it can literally take any single hit you want. The set I use all the time is :

Florges (F) @ Leftovers
Ability: Flower Veil
EVs: 252 SDef / 252 HP / 4 SAtk
Calm Nature
- Wish
- Protect
- Moonblast
- Aromatherapy

Perfect for curing/ healing your team as well. but I was thinking of putting toxic somewhere so I can wish/protect/toxic stall