Magnemite attaches itself to power lines to feed on electricity. If your house has a power outage, check your circuit breakers. You may find a large number of this Pokémon clinging to the breaker box.
The Reverse Holofoil version of the card was printed with an empty white circle where the Resistance would go. The card should be played as if it had no Resistance, just like the regular version of the card.