Eviolite won't work with the spiky eared Pichu or Floette E(assuming you'd want to know because of that) because they are incapable of evolving.
However, the Spiky Eared Pichu can't evolve like other Pichu.
It cannot evolve, like the Spiky-Eared Pichu. As far as we know, it cannot use the Eviolite.
Hope I helped.