Cloyster is a terrible Spikes setter, unfortunately, due to his typing and unbalanced stats. Try the typical Shell Smash set instead.
Cloyster @ Leftovers / Focus Sash / White Herb / Life Orb
Naive - Skill Link
252 Speed, 196 Attack, 62 Sp. Atk
Shell Smash doubles your Attack, Sp. Atk, and Speed stats, allowing you to sweep entire teams if unprepared. The item used depends on your preference. Focus Sash ensures he won't be KO'd before he gets up a Shell Smash. White Herb negates the Defense and Sp. Def drops from Shell Smash. Leftovers gives him recovery over time, while Life Orb gives him an unnecessary boost in power. Skill Link turns Icicle Spear and Rock Blast into 125 base power moves, and they get great coverage. Hydro Pump is for hitting Steel types hard, since they are the only thing that resists both Rock Blast and Icicle Spear. It also takes a huge chunk out of Skarmory.
If you want a hazards setter, then Alakazam should leave for Forretress, who has access to all 3 hazard moves and Rapid Spin. I find Alakazam rarely makes important KOs anyways, and the things he does check are already checked by Landorus and Cloyster.
Forretress @ Leftovers
Sassy - Sturdy
40 HP, 216 Defense, 252 Sp. Def
-Spikes / Toxic Spikes
Getting access to all 3 entry hazard moves AND Rapid Spin makes Forretress one of the best hazard setters out there. Stealth Rocks is arguably the best hazard. Spikes / Toxic Spikes puts additional pressure on the opponent, especially if you get them up early. Gyro Ball stops him from being complete taunt bait, and hits Rock and uncommon Ice types for some decent damage. Rapid Spin is self explanatory.