>>16736342>Mega GardevoirMega Gardevoir has a very good chance of going OU once Hyper Voice becomes available. If not it's going BL. I don't know if you've tried fighting a M.Gardevoir with Hyper Voice on Showdown, but it is SCARY powerful, and hits through Substitute. It's also pretty quick and pretty durable vs special attacks.
>SylveonSylveon is most likely going OU. The thing can tank like crazy and hit back really hard even with no EVs invested in Special Attack. It easily has the bulk and typing to begin setting up Calm Mind. Even things that supposedly counter fairies have a hard time sticking around vs a bulky Sylveon with even one level of Calm Mind.
>FlorgesMost likely on your list to go to UU.
>TogekissWill be OU.
>ClefableYou'd better hope this thing doesn't go to UU. I have nightmares about Cosmic Power/Charge Beam Clefable... it's so hard to stop this thing from setting up, even for the hyper offensive pokemon in OU.