I would nerf or flat out retcon the eviolite to not effect stats. The idea of helping out nfe pokemon is nice but completely outclassing their evolutions is just plain stupid. I mean, probably half the reason we have not seen any new evolutions bar Sylveon is because of the stupid rock, imagine if they evolved Skarmory to be slightly faster and more offensive, it would be completely out shined by a lame unevolved wall. The eviolite is literally stunting potential and any good it's doing is at the cost of another mon like Dusknoir and Blissey, nerf the thing and throw it in the trash \o/