Charizard is a draconic, bipedal Pokémon. It is primarily orange with a cream underside from the chest to the tip of its tail. It has a long neck, small blue eyes, slightly raised nostrils, and two horn-like structures protruding from the back of its rectangular head. There are two fangs visible in its upper jaw when its mouth is closed. Two large wings with blue-green undersides sprout from its back, and a horn-like appendage juts out from the top of the third joint of each wing. A single wing-finger is visible through the center of each wing membrane. Charizard's arms are short and skinny compared to its robust belly, and each limb has three white claws. It has stocky legs with cream-colored soles on each of its plantigrade feet. The tip of its long, tapering tail burns with a sizable flame, which can intensify to a blue flame if Charizard is irritated.

Charizard flies in search of powerful opponents to battle, and its fire will burn hotter as it gains experience. Its fiery breath is capable of melting boulders and massive glaciers, and has been known to accidentally cause forest fires. Though its fiery breath is hot, it never turns it on any opponent weaker than itself. Charizard typically inhabits mountains and valleys, such as the Charicific Valley in Johto. The anime has shown that only a weak Charizard would show off its power. It also showed that Charizard can swim underwater, with Pokémon Origins further showing that the flame on the tip of the tail can still keep burning underwater. Charizard's wings can carry it to an altitude of 4,600 feet (1,400 meters). Charizard lives in herds with Charmander.

Forms
Charizard has three alternate forms: Mega Charizard X, Mega Charizard Y, and Gigantamax Charizard.

Both of Charizard's Mega Evolutions feature a shorter snout, white, vertical slit pupils, and a bright underside reaching the lower jaw.

Mega Charizard X
As Mega Charizard X, its body and legs are more physically fit, though its arms remain thin. Its skin turns black with a sky-blue underside and soles. Two spikes with blue tips curve upward from the front and back of each shoulder, while the tips of its horns sharpen, turn blue, and curve slightly upward. Its brow and claws are larger, and its eyes are now red. It has two small, fin-like spikes under each horn and two more down its lower neck. The finger disappears from the wing membrane, and the lower edges are divided into large, rounded points. The third joint of each wing-arm is adorned with a claw-like spike. Mega Charizard X breathes blue flames out the sides of its mouth, and the flame on its tail now burns blue consistently. It is said that its new power turns it black and creates more intense flames.

Mega Charizard Y
As Mega Charizard Y, it becomes sleeker in appearance but retains its normal coloration. It has three pointed horns on the back of its head, the middle of which is longer. Its snout has larger fangs and a ridge on the nose. Its neck is shorter, but its torso is thinner and longer. It features longer digitigrade feet. Its hands are less developed, with extremely shortened fingers that are no longer separated from each other. Small wings develop on its wrists, while the ones on its back become larger, lose the wing finger passing through their membrane and end up with ragged edges. The back of its tail has a large spike at the base and three smaller ones near the tip, which now burns with a longer flame. Mega Charizard Y is said to have incredible flying prowess that is greater than a jet fighter.

Gigantamax
As Gigantamax Charizard, it becomes larger and more physically fit. The lower part of its body glows white with several yellow diamonds located on the lower belly. There are also diamond-shaped spots located on the front legs. The claws located on its hands and feet become longer and sharper. The feet become longer and digitigrade, retaining small glowing soles under the forefeet. The sclerae of the eyes become yellow. The glow of a flame can be seen in the mouth, and the teeth grow, with the lower front teeth and three teeth in the middle now protruding when the mouth is closed. The flame on the tail extends out and has three red clouds surrounding it, like the clouds most other Gigantamax Pokémon have. Two flames sprout from its horns, and its wings are transformed into literal flame wings extending to the shoulder blade. These colossal flamed wings were created from the energy of Gigantamaxing, and are hotter than magma; Gigantamax Charizard uses these flames to burn its opponents. The flames within Gigantamax Charizard burn hotter than 3,600 degrees Fahrenheit (2,000 degrees Celsius), and increase in temperature when it roars.

Evolution
Charizard evolves from and is the final form of .

(Source: Bulbapedia)