Dragon Pulse and Ice Beam are redundant. They are just used mainly for Dragon types. Dragon Pulse is cool, but only hits super effective on Dragons. Just use Ice Beam, since it hits Grass types for a super effective damage too. Just run Recover over D.Pulse.
On Reuniclus, it should not run Dual Screens because it is very slow. Faster Pokemon like Cresselia can run a Dual Screener set. Reuniclus can be more like a set-up sweeper with Calm Mind.
Reuniclus @ Leftover (survivability) or Life Orb (More raw power)
Nature: Bold [to take physical hits better while it gets some boosts]
Magic Guard
252 HP 252 Def 4 SpD or 4 SpA
-Calm Mind
-Psyshock
-Focus Blast
-Recover
Why not also try an annoying Trick Reuniclus set?
Reuniclus @ Toxic Orb / Flame Orb [Toxic Orb wears down those Special Attackers / Walls, while Flame Orb is good for those Physical Attackers not named Conkeldurr or Heracross]
Nature: Bold
Magic Guard
252 HP 252 Def 4 SpD or SpA
-Trick
-Calm Mind / Focus Blast
-Psyshock / Psychic
-Recover
Rocky Helmet on Ferrothorn might seem nice on paper, but actually it is not. Some Ferrothorn counters like Magnezone would hapilly come in as it resists everything Ferrothorn can use. An all-out attacker Heatran can easily come in and can use Fire Blast for Ferrothorn or Scolipede, Earth Power on Chandelure, or just set-up Stealth Rocks while you do the switch. It can also come in on Chandelure's Fire attacks. Those two are the current threats for your team if ever Scolipede is gone. Air Balloon Heatran can easily come in on Scolipede's EQ, you pop the Balloon on the next attack, it Fire Blasts everything. However, Heatran can be walled by Milotic all day even if it does carry HP Grass / Electric.
252SpAtk Flash Fire
Heatran (Neutral)
Hidden Power (Grass) vs 252HP/0SpDef Marvel Scale
Milotic (Neutral): 31% - 38% (126 - 150 HP). Guaranteed 4HKO.
Magnezone can be a problem as it kills Milotic immediately.
252SpAtk Choice Specs
Magnezone (+SAtk)
Volt Switch vs 4HP/0SpDef Marvel Scale
Milotic (Neutral): 93% - 110% (312 - 368 HP). Guaranteed 2HKO. 64% chance to OHKO.
It can also carry HP Fire to kill Scolipede on the switch. But Scolipede's speed and Earthquake can kill it if you choose to revenge kill.
252Atk Life Orb Swarm
Scolipede (Neutral)
Earthquake vs 252HP/0Def
Magnezone (Neutral): 113% - 136% (392 - 468 HP). Guaranteed OHKO.
So if your suggesting that I don't use rocky helmet, then what else? Regardless of Heatran or Magnezone (which I understand how common they are), rocky helmet would still be the best item to use for it, wouldn't it? It's pretty much a staple for Ferrothorn. And thanks for the Trick Reuniclus suggestion. Love it. But in that case, should I then make Umbreon a passer for more setup? Thanks :) Check out the changes I made now.