a 2200+ TECHIE Magnezone with Magnetbomb can clear pretty much up to ex 3-1 without any real difficulty. Perhaps discharge or thunder wave for a second move for support would be useful if going that route, but you'd still have to damage-rope the bosses if you don't want time to run out.
More like Thunder for power. Magnet Bomb does a good enough job keeping everything the hell away from you already and you need a power move to support it, it simply does too little damage on its own, Techie or not. (And Techie is just the low-rent version of Punchy anyway.) It can "damage rope" pretty well with its triple knockback, though.
"Pokey and the man." Quote for PKMN Pearl, AW:DoR, Brawl FCs.