Gives immunity to electric type attacks
If this pokemon is attacked by physical moves the attacking pokemon recieves leeched damage for three turns
Post any ability ideas you would like here!
If this pokemon is attacked the pokemon it is battling becomes a dark type
Rubber Skin already kind of exists, with Volt Absorb, and Lightningrod and Motor Drive. :(
As for the last one though, that could be interesting if dark actually was associated to shadow types, or something evil, so it might be likely.