0006 Charizard

Wing Attack is the most preferable Fast Attack on Charizard due to its superior energy generation, while maintaining decent DPT. Fire Spin is a decent move, but is generally outclassed by Wing Attack because other Fire-type Pokemon such as Talonflame and Ninetales are better at dealing consistent Fire damage. Dragon Breath is a powerful move, but lacks STAB, and generally falls behind against neutral opponents. Air Slash is just inferior to Wing Attack

Blast Burn is a limited move obtained through Community Day events, but it's mandatory for optimal usage of Charizard. An incredible 2.2 DPE (Damage Per Energy) rating allows Charizard to output huge amounts of damage without paying high energy costs. Even when resisted, Blast Burn would still have a greater DPE value than neutral Dragon Claw, but not when it would be doubly resisted. Dragon Claw is recommended for its cheaper energy cost and Dragon-type coverage. The update to Overheat following the Dec 2019 rebalance makes it a decent choice if Blast Burn is unavailable, but a significant self debuff of -2 ATK makes it more risky and less reliable. Fire Blast costs too much energy, and Flamethrower is a direct downgrade of Blast Burn. 

A fan-favorite from other Pokemon games, Charizard first gained popularity in PvP during the Silph Arena's Kingdom Cup. While a relatively high ATK stat offers good offensive capabilities, a lack of bulk combined with a risky typing and a double weakness makes Charizard difficult to use. In addition, Charizard also requires access to the legacy Blast Burn obtained from its Community Day in order to perform optimally in most cases, which limits its accessibility. However, thanks Wing Attack's impressive energy generation as of the Season of Mythical Wishes update, Charizard is more than capable of burning its opponents to ash with its extremely powerful Blast Burn over and over again.. 

Charizard's devastating moveset allows it to perform well in the Ultra League, shredding even the sturdiest Pokemon with repeated Blast Burns. Risky vulnerabilities and unspectacular bulk are still major problems for Charizard though. Access to Dragon-type moves is valuable against popular Dragon-types like Giratina.  

Charizard lacks sufficient stats to perform well in Master League. Unspectacular energy gains often make Charizard too slow to keep up with Pokemon with faster movesets, not to mention numerous losses against Pokemon with legendary stats and common Dragon-types, despite access to Dragon-type moves.