If you play Pokemon Unite, you should read this. If you don't play Pokemon Unite, download it right now, it's a very good game almost equal to Minecraft in my opinion, but if you don't want to not my problem, your choice
Ok, let's start with my opinion on Charizard...note that most of the things here is from my opinion
Also I suggest you play Pokemon Unite in order to understand this
_____________________________________________________________________________________________

Pokemon Review
Charizard is quite good for taking on 2-3 people at once and it has like crazy repeating damage. Cooldowns of abilities are medium and the abilities itself are quite op.

Moveset
You should choose Flame Burst to start with when using Charizard. Then only choose your second ability, Fire Spin. Then, you should evolve your abilities from Flame Burst to Fire Punch and Fire Spin to Fire Blast.

Moves Review
Most of Charizard's moves deal burn damage. Fire Punch can be used to chase another Pokemon running away but you need to aim carefully, this move can also to be used to escape since it doesn't need a target to activate. Fire Spin will make you throw a spinning orb that will explode in a fire vortex dealing damage to the Pokemon in it, Fire Blast just have more area and damage, this move can be used when taking on lots of Pokemon. The Unite Move will make you fly up into the air and fly back down again, when you reach the ground you will stay up in the air for a few seconds so you can attack to Pokemon below without getting hurt, but you cannot use your special abilities when in the air (Hindrance Resistance) or score goals.

Rating (My Opinion)
HP: High
Damage: High
Speed: Medium
Supporting: None
Defending: Low
Scoring: 3/5

HP = Your Pokemon's health
Damage = Your Pokemon's damage
Speed = Your Pokemon's speed
Supporting = Your Pokemon's ability to heal/support other ally Pokemons
Defending = Your Pokemon's ability to block attacks from enemy Pokemons so nearby low-health ally Pokemons won't get the hit
Scoring = How fast you Pokemon can score goals (Got the info from the game itself)