Truth be told, Cloyster is more effective as a sweeper than a physical wall. You want Skill link, so he can fire off awesome Icicle Spears and Rock Blasts. Combine that with Shell Smash to boost his speed and attack and use either Ice Shard or Razor Shell as the final move.
My Cloyster looks like this:
Crenshaw @ Focus Sash
Skill Link
Jolly (-Sp. atk. + Speed)
Evs: 252 Attack, 252 Speed, 4 HP
-Shell Smash
-Icicle Spear
-Rock Blast
-Razor Shell
Note, I mainly use him in Rotation battles, but he'll function best as the lead in a regular match. Focus Sash will allow you to almost always successfully pull of a Shell Smash, after that it take take lots of mons Single handedly. He's guaranteed to carry his weight in the Battle Maison, and is one of my favorite team members overall.
If you want something that's really good at both confusing and paralyzing, go for Sableye or Klefki, their Prankster ability will make it a lot easier for you. If you wanna stick with Rotom, I'd suggest changing his form into the Laundry machine one. It has good defensive stats and typing and is able to hit fairly hard as well.
Alright, your Espeon doesn't need two Psychic attacks, just stick with either Psychic or Psyshock. Dazzling Gleam is a good choice to take out Dragons and Dark types, so that's a handy move to keep around. Grass Knot and Shadow Ball can also be used to provide you some extra coverage. If I were you I'd ditch Confuse ray, simply because Espeon is much better of attacking. Pair him up with a Life orb, Choice Specs or an Expert belt to maximize your damage output.
Lucario would be a nice addition to your team, combining the useful resistances of the steel types, while also providing great coverage with its Fighting type.
Hope this helps you a bit! =)
There used to be a link to an Imageshack picture here. Lmao.