Gigantamax Charizard
Dynamax
Fast
Charge
PvE Analysis
The current apex of the Fire Dynamax meta, and the ultimate counter to Gigantamax Venusaur as of right now, Gigantamax Charizard has the safest position among the three Gigantamax Kanto starters. Its closest competition, Cinderace, has more raw Attack, but G-Max Wildfire more than makes up for that fact. With that said, it does have some future competition in Gigantamax Cinderace and Gigantamax Centiskorch; the latter has nearly as much Attack as Charizard, but has higher stats overall and a 0.5s STAB move to charge up the Max Meter more quickly.
Gigantamax Charizard is locked into having a Fire-type Max Attack. Dragon Breath is the recommended Fast Attack to pair with its G-Max Wildfire due to its 0.5s duration, enabling it to charge up the Max Meter more quickly than its other options. Fire Spin can serve as a viable alternative for those who do not wish to use an Elite Fast TM on their Gigantamax Charizard. Charged Attacks are mostly irrelevant in challenging Max Battles, so do not worry too much about them.
PvP Analysis
In PvP, Gigantamax Charizard is effectively no different from a normal Charizard, except without access to Return as a move option.