Kamex

Blastoise is a large, bipedal turtle Pokémon. Its body is blue and is mostly hidden by its tough, brown shell. This shell has a cream-colored underside and a white ridge encircling its arms and separating the upper and lower halves. Two powerful water cannons/jet nozzles reside at the top of its shell over its shoulders. These cannons can be extended or withdrawn. Blastoise's head has triangular ears that are black on the inside, small brown eyes, and a cream-colored lower jaw. Its arms are thick, and it has three claws on each hand. Its feet have three claws on the front and one on the back. Poking out of the bottom of its shell is a stubby tail.

The powerful cannons on this Pokémon's back can produce water blasts that can pierce steel and concrete and be used for high-speed charges and propelling itself in the air. The speed of Blastoise's charges is similar to the force of a rocket. Blastoise makes itself heavy to withstand these powerful blasts and crush its opponents. It is shown in the Pokémon the Series episode Beach Blank-Out Blastoise (EP060) that Blastoise can take the role of a leader in large groups of Squirtle and Wartortle. Its preferred habitat seems to be freshwater ponds and lakes. Blastoise is capable of flying by propelling itself with water from the back openings of its shell. As shown in Pokémon Sleep, Blastoise is known to sleep soundly while protected by its tough shell. It has also been seen sleeping with its belly exposed on very rare occasions, meaning that it is feeling completely secure in its surroundings and has quickly fallen asleep.

Forms
Blastoise has two forms: Mega Blastoise and Gigantamax Blastoise.

Mega Blastoise
Mega Blastoise has two smaller shells over its arms, each with its own water cannon. Small ridges develop over its now-red eyes and extend to its ears — which angle slightly backward — and there is a small point on its chin. The two cannons on its back merge into a single, central water cannon of greater size that extends forward over Mega Blastoise's head and can retract back into its shell.

Mega Blastoise has a more aggressive disposition due to its increased strength. The power of its main cannon is equivalent to that of a tank gun at minimum and possesses a blast range of over 6 miles (10 kilometers). Its strengthened legs and back enable it to withstand the recoil from its own blasts, but it can also use its arm cannons to further support itself by using moves like Ice Beam to latch itself to the ground before firing a massive attack, such as during its Burst Attack in Pokkén Tournament.

Gigantamax Blastoise
As Gigantamax Blastoise, it becomes larger. Its eyes are white with bright blue sclerae. Its blue arms, head, and legs change to light blue, and the underside of its shell becomes dark red. Its shell becomes darker and transforms into a battleship-like formation, with 31 cannons of different sizes: sets of twin cannons emerge from hexagon and rectangle-shaped holes within the shell, and a main cannon protrudes from the center. Several white triangular spots are located on its tail and legs. Three red clouds surround the main cannon.

Gigantamax Blastoise can adapt to any situation using various cannon combinations. It is not very good at precision shooting, so instead of aiming its attacks, it prefers to overwhelm its opponent by launching dynamic, powerful torrents from its cannons. According to one legend, its main cannon is so staggeringly powerful that it can blast holes through the mountains. Gigantamax Blastoise can also individually align the 12 cannons surrounding its main cannon to attack in any direction.

Evolution
Blastoise evolves from and is the final form of .

(Source: Bulbapedia)