Alright. Magneton: the original beast magnet from the original game.
What is there to say about it? Well, it's three magnets. Pretty strong magnets! This trio is devastating if used right. That is why I propose this:
Bulky Eviolite Magneton:
EV's: 252 HP, 252 Special Defense, 4 Defense
Nature: Calm (+ Sp. def, - attack)
Ability: Your Choice, preferably Analytic
Try it out! You never know how much it could help your team.