Story behind this is something I read in a thread on 4chan's /v/ (video games) board about Pulseman. For those who don't know, it was a game on the Genesis (Mega Drive) by GAME FREAK, who are probably better known for the Pokémon series.
Well, they like to make references to Pulseman in their other games. The attack unique to the Pikachu family, Volt Tackle, is named after Pulseman's signature move, Volteccer. In fact, the behavoir of Pikachu's Final Smash in Super Smash Bros. Brawl is somewhat similar to Pulseman's usage of Volteccer (turning into a ball of electricity and bounce all over the place).
The Pokémon Rotom looks a bit like Pulseman, particularly how it has that spike on its head. Additionally, when you meet Rotom, it comes out of a TV. Pulseman comes out of a monitor at the beginning of a stage.
So, I made this as a tribute of sorts to Pulseman. Done entirely in Photoshop.
I've also made a modified Rotom in PokéSav (Diamond/Pearl save file modifier) to go along with this.