at B+/A-
+available super-early in Gearen City from the guy that sells Pokeballs for 400P
+available evolved before Keta (evolves at 30, then you can lower it a bit)
+incredible speed barring speed-altering situations (Water surface and Crawli's Barbed Wire)
+an abusable moveset: Charge Beam(lvl16), ElectroBall (lvl22), Discharge (lvl41), Eerie Impulse (lvl6) (lowers opponent's SpAtt two stages)
+very fast Light Screen support if you're bad in using Electrode, and yes, Light Screen is bad
+great at cheesing single Pokemon bosses like Shadow Mewtwo, outspeeding and lowering their SpAtt as much as possible before going down, opening a way for teammates to beat them easier
++great monosweeping potential:
In Singles, it can single out an opponent's special attacker, abuse it's speed and spam two or three Eerie Impulses to nil their SpAtt, heal up, take minimal damage barring crits hax and set up Charge Beams while the opponent either does minimal damage or heals. Considering that Charge Beam takes a while to reach KO potential, you can reach a respectable +4 and higher in many situations before your setup bait dies. Then proceed to click the right STAB (Electric is a largely unresisted type and ElectroBall breaks easily many slow bulky opponents) and sweep teams easily. Even if the sweep is full (hello Slaking, hello Gengar because Spiritomb's Pressure killed my PP) you still have abused one Pokemon to destroy ~4 of the opponent, and have enough to deal with what's left.
-terribad coverage: Hidden Power x-type (hunt for Ice or Grass preferably), Swift, that's it
-lackluster stats barring speed: its bulk is 0 without abusing Eerie Impulse, its SpAtt is really bad without setting up lots of Charge Beams
-Doubles: other than setting said bad Light Screen or fishing for a Para or two with Discharge or singling out an opponent to use Eerie Impulse, it's really bad in Doubles
-no access to Thunder Wave: ok, it can do it's job anyway, but T-Wave would go so incredibly perfect with it
-speed drop situations render it useless: looking at the current field of Valarie, and also Crawli if he sets webs and you can't remove them
-I didn't need to abuse it in later fights: I abused it to wipe out most of Narcissa's and Marianette's teams easy and sweet, as well as both Keta matches, some Ren fights, Amaria, etc, but I haven't used it against Crawli and Angie because I had much better solutions that wiped them out (Defiant Empoleon and Justified Arcanine, ggs)
-requires support with Intimidate or/and Baby Doll Eyes to use physical attackers as setup bait: Herdier-Stoutland make the best partner, I guess
-the very rare Contrary, Defiant or Competitive opponents
-crits hax
Why B+/A-? Because it can sweep through many teams in singles, and while I haven't used against the later leaders... the reasons that make it abusable are still there. I just had better things to throw at them (and still haven't played Zetta/Geara and Amber), but the upcoming nerf to the Water surface will help it against Valarie, and it could exploit future leaders as well. I throw my body at it being ranked lower that B+ on the grounds of that sweeping potential, and also of the ability to severely reduce the SpAtt of single-Mon bosses and make them much easier to take out with the rest of the team.