Running a bit behind, here we have Druddigon from NV (which I keep misspelling as Druidgon for some reason...dang WoW). Statwise 100 HP is nice for a Basic, no Weakness is nice, no Resistance is common, and :colorless::colorless: to Retreat is a bit pricey. Rough Skin is a decent Ability, punishing the opponent for attacking by placing 2 damage counters on the offending Pokemon (imagine this with Rocky Helmet). Clutch works to keep them there too, granted 60 for :colorless::colorless::colorless: is overpriced, but the facts it pins them in the active position (combined with bringing up something they don't want brought up with Catcher) makes it interesting to say the least.
Modified - 6/10 (I like it personally, but it is lacking in the HP department, where your usual terrors of Zekrom and Reshiram will toast it, not to mention Clutch is kinda meh)
Limited - 10/10 (Fits into any deck and gives you a big Basic with a nasty Ability and decent attack)
Unlimited - 1/10 (Too much Energy to set up, and the Ability isn't that gamebreaking here)