Pfft...that's only half a moveset. T_T
Standard forry is something like so:
Forretress @ Leftovers/Shed Shell
Relaxed Nature (+Def, -Spd)
Gyro Ball
Earthquake/Spikes/Reflect/Light Screen
Rapid Spin/Spikes/Reflect/Light Screen
Rest/Explosion
EVs basically consist of a crapload of HP and Defense, possibly with some obscure magical number in Attack to KO something or the other. Smogon says 252 HP / 92 Def / 164 Atk, but you can experiment with it. If you run Light Screen, putting that Atk into SDef will reduce Magnezone's attacks to a three-hit KO unless it has Hidden Power [Fire]. Leftovers are the preferred item, but if you're Magnet Pull paranoid (and don't have the confidence in your ability to predict them and nail them on the switch with quake) then Shed Shell is also an option. Relaxed over Impish to maximize Gyro Ball's impact. :3