I guess Electric-types decided they needed more dakka. I don't care if its other stats are subpar, make it so that even its Thundershock would make Special Walls tremble!
Do I really need to say it has STAB? It has so much STAB its only other Special moves are Signal Beam, Energy Ball (which you can't really complain about on an Electric-type) and Dazzling Gleam. Utilities give it Tail Glow (MORE POWER!), Ingrain (wait, what? I know its name is a pun on "circuitry" though since it does have "tree" in it was it mean to be a Grass-type at one point?), Eerie Impulse, Hypnosis, Electric Terrain, Ion Deluge, Calm Mind, dual screens, Volt Switch, and Thunder Wave.
Not bad for Christmas lights :P. If anything Speed holds it back unless it has a Scarf, and even then other Scarf users may outspeed it.