Well, back when the card came out in 2009, Flygon from Rising Rivals was a major deck basis and players like David Cohen, Jay Hornung (I think) and Nicholas Fortheringham (I think that’s hoe you spell it) used it to well placed finishes at Worlds. You could use the deck in many ways.
- Deck out. With Flygon Lv. X, Palkia Lv. X, and Trapinch SW, you could put your opponent into a lock that would make them deck out. Nidoqueen RR was also used to heal damage.
- Attack! Flygon Lv. X’s attack was used to get rid of Lv. Xs. Cards like Machamp SF were teched in to provide even more damage as well as take down SP Pokemon, which at the time were constantly growing in popularity. Some variants also used Mewtwo Lv. X to provide protection while setting up. Flygon SW was also used to spread even more damage to the opponents Pokemon.
Unfortunately, Flygon did not see much more play after that and did not see any top 4’s at worlds 2010. Probably because of the growing popularity of Luxchomp.