This pokemon papercraft is Rayquaza, a dual-type Dragon/Flying Legendary Pokémon, based on the anime / game Pokemon, the paper model was created by javierini. There is another Rayquaza paper model on the site: Pokemon Rayquaza Papercraft Ver.1.
Rayquaza is not known to evolve into or from any other Pokémon. It can Mega Evolve into Mega Rayquaza if it knows Dragon Ascent.
Rayquaza is the version mascot of Pokémon Emerald, appearing on the boxart of the game. It serves to end the conflict between Kyogre and Groudon when Team Magma's leader Maxie and Team Aqua's leader Archie awakened them. Along with Kyogre and Groudon, Rayquaza is a part of the weather trio, serving as its trio master.
Rayquaza is a large, green, serpentine creature. It has red-tipped, rudder-like wings on its shoulders and down its body, and similarly patterned fins on the tip of its tail. Yellow ring-like symbols run across the length of Rayquaza's body and it has an additional yellow ring on top of its head. Rayquaza has two limbs with three-clawed hands, and two long, flat, horn-like structures on its head. It has small, yellow eyes with black pupils, prominent pink gums, and two discernible fangs in its upper jaw.
As Mega Rayquaza, is body becomes longer and gain more features. Its head becomes longer with the Delta symbol appearing on its forehead. Black tree-like marks appear on its eyes. The red lips and white teeth changes the color gold. The gold lines are connected and added to the teeth, and spikes. The two flat horns on the forehead are larger now, with two yellow, orange whiskers, white a circle and diamond at acted to them. The cheek bones now has two flat, triangular-shape spikes, which another orange, yellow, whiskers, this time with four infinity symbols each, and a green bird-like shape. The lower whiskers are attached to a yellow spike like structure. The eyes are now colored yellow, with red pupils. The yellow rings are replaced with orange, yellow orbs, except the the sign on its head. The chin, part of the neck, and parts of its serpentine boney are changed to the color black. The serpentine parts of its body gain three spikes on the green parts of its body, between the black orbs parts each. The spikes on is replaced with two yellow tails. Particles stream from the long filaments that extend from its jutting jaw. These particles can control the density and humidity of the air, allowing Mega Rayquaza to manipulate the weather. Its green hide sparkles with an emerald-like quality.
Inside Rayquaza's body lies an organ that contains the same power of a Mega Stone. A Devon Corporation scientist named this organ the mikado organ. By consuming meteoroids as it flies through the stratosphere, the mikado organ will be filled with enough energy to allow Rayquaza to Mega Evolve.
It is able to soothe the other members of the weather trio. Rayquaza can live for hundreds of millions of years in the ozone layer, where it feeds on water and other particles. Rayquaza is rarely seen by people; even in flight, its appearance is indistinguishable from that of a meteor. [Source: bulbapedia]
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