My favorite Electric type Pokemon is Manectric. And that is due to me having a Manectric that I've had for an extremely long time and that's hippity-hopped her way across all of my Pokemon games.
The Manectric nicknamed SPARKEY was given to me by an IRL friend who traded it to my Fire Red game from his Sapphire game back in 2007.
Since then SPARKEY has been transferred to all of my Pokemon Games, from Fire Red to Diamond, to White, to X, and to Alpha Sapphire(I even got a special award for my Secret Base for transferring her that much), before finally going to Moon, and ending at Ultra Moon, where she resides to this day.
My Manectric is one of my oldest Pokemon that I still have around.
Manectric - Pokemon/Nintendo