for charizard:
flamethrower/heat wave
air slash
dragon pulse
brick break/earthquake
charizard has higher special than physical
[glow=red,2,300]flamethrower[/glow] and [glow=red,2,300]heat wave[/glow] for STAB, se against grass, ice, bug, and steel, heat wave, having more power and hitting both pkmn in a 2vs2, flamethrower, hitting a single pkmn, but this could be better in a battle if one pokemon you're battling has something like flash fire for an ability (both special)
[glow=white,2,300]air slash[/glow] for STAB along with being se against grass, fighting, bug, and ground [i think](special)
[glow=blue,2,300]dragon pulse[/glow] for dragon type opponents (special)
[glow=brown,2,300]brick break[/glow] for normal, ice, dark, steel, and rock types or [glow=brown,2,300]earthquake[/glow] for electric, rock, fire, poison, and steel (both physical)