BoltBeam(Electric+Ice) EdgeQuake(Rock+Ground) has the highest coverage at
179 Normal Effectiveness
490 Super Effectiveness
Called BoltBeam and EdgeQuake because the most powerful moves in those catgories that are learned by the most pokes are, respectively, Thunder bolt and Ice Beam, Stone Edge and Earth quake
Mew, Regigigas, Machamp, and Hitmonchan can all learn ThunderPunch, Ice Punch, Stone Edge, and Earthquake for a physical spread.
Arceus, Nidoqueen, Nidoking, Mew, Dialga and Palkia can learn Ice Beam, Thunderbolt, Earth Power, and Power Gem or HP Rock for a special combo.