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Magcargo is such an awkward motherfucker and I super wish it got Shiftry'd. Give it a signature that makes it immune to water moves, and it would be all okay. If not, just give it Solid Rock.
it's got solid STAB with Flamethrower, Power Gem, Ancient Power, Lava Plume, and Overheat. really good utility moves in Yawn, Rocks, Will-o-Wisp, Memento, Clear Smog, and Screens, but all it desperately needs is coverage. outside of Earth Power, the only special moves it has that aren't STAB are Smog, Clear Smog, Mud Slap/Shot, and Solar Beam.
I'd suggest giving it Energy Ball, Sludge Bomb, and Weather Ball.