I'm not sure if anybody has mentioned this yet but:
Floette @ Eviolite
Ability: Flower Veil/Symbiosis
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
IVs: 0 Atk
- Wish
- Protect
- Moonblast/Psychic/HP Fire
- Toxic
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With base 98 special defense and Eviolite, Floette is a great special wall. Zero attack IVs are only to lower confusion damage. The set itself is pretty explanatory, using Toxic for gradual damage and using Wish/Protect to heal off damage or heal teammates. Moonblast is the preferred attack for STAB, but with Pokemon like Nidoqueen, Venomoth, and Golbat running rampant in the meta, Psychic is a good choice as well. Finally, HP Fire is to deal with Steel types like Ferroseed and Magnemite that also pose threats to Floette.
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I'm godawful at writing analyses or whatever so the above probably doesn't make sense xD Not sure if HP Fire would be useful but Moonblast and Psychic have both been beneficial
TL;DR it's a great special wall