Skarmory doesn't seem too bad for a Klinklang deck - especially with Registeel. Triple Laser + Drilling Driver + Muscle Band = 170. Enough to KO a lot of EX's in one hit. Triple Laser/Drilling Driver is also enough to KO a lot of non EX attackers, such as Blastoise, Reshiram, Empoleon and Bouffalant (Kyurem and Absol are already easy to OHKO). Joust is just okay. G Booster is a huge problem for Klinklang, so Joust paired with an N could be deadly for Genesect. I think this card is proof that they can't make really good Metal EX's, otherwise they'd be broken.
Emolga is... eh. It's not the worst EX, but only because it has decent typing. It's the only good Lightning type that only takes 1 Lightning Energy to attack, other than Zekrom PLF.