I only cute ;3 (Eevee) @ Eviolite
EVs: 236 HP / 36 Def / 236 SpD
Yeah this thing is just fluffy fur and cute. That's all. Offensively it is outclassed by Bunnelby the Huge Powerful Rabbit of LC because that gets Swords Dance and Huge Power STAB hits harder than Adaptability. So therefore, it arises no use of a physical attacker Eevee because this thing's movepool is only cute but not stronk.
Wish cleric support. Double-Edge still does quite a good damage with Adaptability boosted STAB, and takes on some of the weaker Pokemon. Yawn cripples set-up sweepers, but watch-out for Taunt. Protect to ensure you get a Wish hopefully, but be careful of prediction; opponent can turn Protect to a predicted turn for a set-up move. Alternatively Sassy nature along with Baton pass can allow a weaker Pokemon to come thereby reducing the risk of prediction.
- 0 Atk Adaptability Eevee Double-Edge vs. 196 HP / 20+ Def Eviolite Mareanie: 10-14 (41.6 - 58.3%) -- 88.7% chance to 2HKO
- 0 Atk Adaptability Eevee Double-Edge vs. 0 HP / 76 Def Vullaby: 14-18 (60.8 - 78.2%) -- guaranteed 2HKO
- 228 Atk Life Orb Buneary Earthquake vs. 196 HP / 20+ Def Eviolite Mareanie: 16-21 (66.6 - 87.5%) -- guaranteed 2HKO
- 228+ Atk Huge Power Bunnelby Stone Edge vs. 0 HP / 76 Def Vullaby: 26-32 (113 - 139.1%) -- guaranteed OHKO
So yeah, Powerful Rabbit emerges victorious over cute fluffy Eevee in case of firepower but Wish is there to make it live.