Suggesting a set which worked for me during playtesting:
move 1: Discharge/Thunderbolt
move 2: Weather Ball
move 3: Flamethrower
move 4: Slack Off
ability: Shield Dust
evs: 176 HP / 82 SAtk / 252 Spe
<p>Cyclohm's typing allows for it to be a decent support pokemon to Hail Teams, resisting both Fire attacks, Electric Attacks, and Water Attacks from any Bulky Waters, while being able to eliminate several pokemon that resist Ice-Attacks.</p>
<p>Discharge and Tunderbolt are both listed for the traditional 'Do I choose sheer power or a higher chance to cripple my foe?' problem, although both are viable, Thunderbolt is suggested, due to the fact that this Cyclohm is used to remove counters to Ice-Types. Flamethrower allows Cyclohm to decimate opposing Ice-types, Steel Types that resist Ice attacks, and to help give better covrage for Cyclohm's Bolt-Beam, which is only resisted by Brongzong in OU, and Lanturn. (Who is never seen in OU) In Hail, Cyclohm gains a Base 100 Ice Attack in the form of Weather Ball, which forms a better-than-boltbeam combination, coming off from a respectable 280 sp.attack. Weather Ball can OHKO many things that think they are safe aginst Cyclohm, usually the slow Ground types. It takes out opposing Dragons that are X4 weak to it, including Garchomps lacking Yache Berry (Although, these dragons need to be caught on the switch-in, due to higher speed).</p>
<p>The EV's listed allow Cyclohm to reach a number of benchmarks. 401 HP is given, to take 5 Tosses to KO. Speed reaches 284, which outspeeds all normal Cyclohm varients, and any base 90 that does not run a Speed+ Nature (Without Speed+, they cap out at 279). The rest are put into special attack, to maximise damage, although, some EV's can be taken out of speed if you don't want to ensure a speed tie against all fellow Base 80's.</p>
Abomasnow is a given for this particular set, as he can start a continuous Hail. Ice-types in general are good paired with Cyclohm, as often he'll be the victim of a faster Dragon, and this set clears out types which wall Ice-types. Articuno warrents a mention, as Cyclohm X4 resists Electric attacks, and Articuno is immune to Ground Attacks.
This Cyclohm can also be used on a Sandstorm team, gaining a base 100 Rock Move, although, the support he gives this type of team is slightly more limited, as it a Fire/Rock/Electric combination.