It's because it takes 2 attacks to KO Gallade/ Gardy with Electromark.
Sonic Blade to 100. KO's Gallade with EM. Send up Gardy/Lade KO's T-Tar.
Lol I just got 2 prizes to your 1.
T-Tar vs. Gardevoir/Gallade isn't too bad, in all honesty. Certainly takes skill to win, but it's not impossible.
Now, Sceptile decks are the problem. Floods of Torterra for instance will make T-Tar ready to break out in tears due to it's x2 Grass weakness and dropping 2 prizes. Heck, knocking out pokemon makes barely any difference against a good Sceptile deck, 'cause it can then just move energy around/attach some more, and pokemon that normally take 4 energy to attack can fight with only 2... It's messy for T-tar, and most likely coming out in GE.
If you wanted to play T-Tar EX d, you really just missed your chance now that Cities are basically over.
For electric, Ampharos is your most solid bet, though it doesn't really have any great partners. Weavile's... Iffy, as it doesn't really help you set up. We're not getting Kabutops in GE, and that's one of it's best friends.
Oh well, the body is painful if you get it out fast enough (and your opponent just so happens to have a huge bench). I'm not sure how much I like the attack against things that aren't Magmortar decks though... If I had to name a friend for Ampharos that I think could work decently, it'd have to be Flygon at this point. Of course, Ampharos might not get to attack that often, but Flygon ex d more then makes up for that.
If you actually want to attack with an Electric type, then Electivire's the best way to go. SW suffers though from the whole "MUST DISCARD ALL :lightning: ENERGY" clause as opposed to "discard as many :lightning: as you like", and being very flippy. DP suffers from needing an incredible set up to be effective, and neither of them have particularly awesome HP (unlike Magmortar). If you're amazingly lucky, I'd say go with Electivire SW, as that's by far the more effective of the two should you be unable to flip heads (and is a better card to be under the LV.X electivire, AND doesn't need Elekid)
Too bad we aren't really getting anything impressive for Lightning in GE. Lightning's rather gimped this year as a type. :/