Rayquaza is a large, green, serpentine Pokémon that also resembles a missile. 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, with two shorter horns along its jawline. It has small, yellow eyes with black pupils, prominent pink gums, and two discernible fangs in its upper jaw. Rayquaza has a strong and endless desire to do heroic deeds for the Pokémon world. Rayquaza is said to be equal to both and Kyogre. For that reason, it is the only one who can halt the endless battles of the other two super-ancient Pokémon, by overpowering them and forcing both back into their slumber, even in their Primal Forms. Rayquaza is also the only one who can stop the two and restore order to nature that they disrupted. Rayquaza is said to have lived for hundreds of millions of years in the ozone layer, where it feeds on water and other particles. There, it feeds on meteoroids, which includes Mega Stones and even Minior. It also loves Rayquaza Treats made by Snacksworth, who once encountered it in the past. Rayquaza is rarely seen by people; even in flight, its appearance is indistinguishable from that of a meteor. For living in the ozone layer, it can breathe in outer space. Rayquaza possesses some of the strongest attack power out of any Pokémon; it can easily summon cyclones to overwhelm its opponents. It can soar into the sky and drop out into its foes at high speeds, causing huge damage. Thanks to its weather-manipulation powers, it can eliminate weather effects. Rayquaza was worshiped by the Draconid people as the savior of the region since ancient times. Thus, they built the Sky Pillar to honor it. Additionally, it can be summoned atop Sky Pillar by multiple Key Stones. In Pokémon Adventures, the Draconids referred to it as their "Dragon Lord". It is one of the longest-lived Pokémon species. Inside its body lies an organ that contains the same power as a Mega Stone, which was named the "mikado organ" (Japanese: ミカド器官) by a Devon Corporation scientist. Rayquaza is bitter enemies with , an extraterrestrial Pokémon that repeatedly invades its territory, with the two often clashing with each other in space. This is depicted in the movie Destiny Deoxys (M07) and in the games Omega Ruby, Alpha Sapphire, and Masters EX. Forms Rayquaza can Mega Evolve into Mega Rayquaza. Thanks to Rayquaza's mikado organ, by consuming meteoroids in the stratosphere, the organ can be filled with enough energy for Rayquaza to Mega Evolve without a Mega Stone and even a Key Stone (as seen in Pokémon the Series: XY). As Mega Rayquaza, its body becomes longer and gains more features. Its head becomes longer with the Δ (delta) symbol appearing on its forehead. Rayquaza's eyes now contain yellow pupils with red irises, and black, shichishito-shaped markings trail behind its eyes. Its red lips and teeth become gold, and the gold lines connect to those on its lower horns, which take on a broad, triangular shape. At the outer edges of its lower horns are long, golden, glowing tendrils that each extend to a green, fin-like structure; these tendrils have ring patterns that strongly resemble the yellow markings running along the length of Rayquaza's normal form. While in flight, these tendrils give Mega Rayquaza a triangular profile. Its two upper horns become longer with a gold line running over them in a V shape, and each upper horn has another glowing tendril that ends in a circular shape with a spike. Along the length of its body are golden, glowing orbs placed where its ring patterns used to be. The chin, part of the neck, and parts of its serpentine body are changed to the color black. The fins running along its body are now marked with gold lines; the fins on its tail become entirely yellow and substantially longer. Particles stream from the long tendrils 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. Mega Rayquaza was said to have been born from humanity's wish for salvation, channeled through the Key Stone of a Draconid Lorekeeper. Rayquaza is the first recorded Pokémon to achieve Mega Evolution and is at its full power when in the Mega Evolved state. Thanks to its weather-manipulating powers, it can change the weather to eliminate all of the Flying type's weaknesses. Mega Rayquaza is so powerful that it can undo the primal forms of Groudon and Kyogre. It's also capable of destroying meteors bigger than itself. It has been referred to as "Δ (Delta)". (Source: Bulbapedia)