Oh right, Pucatrade. That's the one I've been told is good. Can't confirm it, but I've got a coworker who's really into it.
Edit: So I'm still playing the Pokemon TCG Online. My deck is just about done, I need a few more cards to finish it and I may tweak the trainers a little, but I basically have all the rare cards I need. It's not incredibly reliable, but when it wins it's glorious. The whole deck is built around
this Gourgeist and
this Malamar. They're both weak, fragile Pokemon, but they don't take too long to get set up and if you get even a couple of turns to set up on a defenseless opposing Pokemon with either of them you basically win.
The deck uses trainers like
Lysandre (the most underrated card in the game in my experience) to buy me time to grind out extra uses of powerful trainers with Malamar or significantly weaken my opponent's entire team with Gourgeist. People often leave heavy, slow Ex Pokes on their bench with the intent to power them up over time, so if I can pull off dragging one out and setting up on it the results are hilarious. It's easy to counter if you know what to expect and there are a number of relatively commonly-played cards that shut me down pretty hard (anything offering free retreats is tough to deal with), but them's the breaks. And I've got a copy of
Life Dew that can create some absolutely crushing advantages for me if I can return it to my hand multiple times a game with Malamar. People often concede on the spot the third time I play it in a game.
Aside from that the deck is just card draw/card filtering stuff to grease the wheels, a toolbox of utility effects, and a handful of Ex or otherwise buff basic Pokemon to clean up once my two all-stars soften up my opponent's team. It's never going to be a good deck, but it's fun enough to play that it keeps me coming back. I actually might buy some more of the cards from this deck in real life so I can play them in the rare event that I play paper Pokemon.