Actually, since Charizard's special movepool sucks(YES IT DOES!!!) u wanna have Sub, unless u are a REALLY good predictor(sp??)
Charizard@Salac
Adamant
FireBlast/Overheat
Belly Drum
Rock Slide
Earthquake
I guess u could put Flamethrower on there somewhere, but FB/O-Heat will be 00ber powerful due to its special ability