Noooo . . . Charizard is the new SD! Only the truly elite players have realised it is better then Toxicroak!
Both SF/Base Set and SW Charizard OHKO Dialga G!!!!!
Seriously, if you wanted to make a fun deck (and who wouldn't cos Base Set Charizard is still cool?) you could play it with Weavile SW for Energy acceleration, free retreat with Moonlight Stadium, and OHKOs on Dusknoir. Maybe throw in a Heatran LV X as well to recover the Energy.