It is not known to evolve into or from any other Pokémon.
Reshiram is the version mascot of Pokémon Black, appearing on the boxart. It is also the first of the Tao trio, which exists in the legends of the Unova region.
Reshiram is a white-colored, bipedal Pokémon of seemingly draconian and mammalian basis, with some of the avian features of feathers. Reshiram's snout is mammalian in appearance, most resembling something vulpine or even canine, or possibly even a goat. Streaming out from the upper side of the snout and outward from the head is a long, voluminous wispy mane, the top of which forms a spike or small head-crest of some sort. Reshiram's face is fringed with spiky features, with one small, pointed extension of it below the chin. Besides being a dragon, it is as well based off of the White Tiger of japanese folklore, which represents yin, the feminine and black side of the yin yang symbol.
Reshiram's neck is long and slender, with a collar-esque protrusion of fur or feathers seeming held in place by two somewhat glass-like neck-bands, with similar bands present on the "wrists" of Reshiram's forelimbs. Reshiram's forelimbs are expansive, wing-like appendages or some unusual sort of wings themselves; the beginning portions of the limbs are slender and generally conventionally arm-like, but flare out into a more wing-like, feathered section farther on the limb, sporting four claws on the leading edge. On Reshiram's chest is a feathered feature most similar in shape to a Silver Wing, with the lower portion protruding outward to a point. Long feathers spread out from Reshiram's thighs, its feet with large claws—three in front, and the one in the back positioned at an angle somewhat like high heels. Reshiram's tail is a thick mass of a center-most plume and ribbon-like secondary extensions, surrounded by two large bands.
Gender differences
Reshiram is a genderless species.
Special abilities
Reshiram has a jet engine-like tail used to accelerate itself when flying in high speeds. It can also store huge amounts of heat energy and unleashes it in one blast and its fire can burn everything into nothing. Reshiram is the only Pokémon that can learn Fusion Flare and Blue Flare, though Victini can learn the former if it's from an event.
Behavior
In a Unova myth about the twin heroes, as Reshiram sided with the older brother who sought truth, the Vast White Pokemon firmly believes in truth. It has a hatred for Zekrom, who sided with the younger brother.
Reshiram is required to be caught in Pokémon Black in order to progress on the story and battle N. Running away from it or defeating it will appear as if nothing happened; also, defeating it does not give any experience points.
It and Zekrom are the only legendary Pokémon in the main series games that are required to be caught to progress the story.
It does not have to be caught if the player has a full party and PC. Instead, it will later appear at Dragonspiral Tower.
Due to its ability, no combination of types and abilities is resistant to both types of Reshiram's STAB attacks.
Reshiram and its counterpart, Zekrom, are the only version mascots to have two signature moves.
Origin
Reshiram and its counterpart Zekrom are based on the concept of yin and yang in Taoism. According to Ken Sugimori, Reshiram has a light, airy, ladylike design to contrast to Zekrom's tough and manly look. Its tail, the center point of its design, is based on a blowtorch or Rocket Engine. Appearance wise, it resembles a mix of animals, including a bird, a canid such as a fox or a wolf, and a Wyvern. It as well shares a few, but not many, traits with the White Tiger, which represents yin, the black, feminine side of yin yang. This would explain why Reshiram is the feminine white one, rather than black like the side it coresponds with. The crest on its head and its feathers resemble smoke trails as well as white fire, which can burn up to temperatures of 1,500 °C (2,730 °F). The mythology about how Zekrom and Reshiram came about, regarding two brothers infighting, also bears some similarities to Cain and Abel.
Name origin
In an interview with the Official Nintendo Magazine UK (Issue 65), Ken Sugimori said that the "shira" in Reshiram's name was from the Japanese word for white, 白 shiro, and the "Re" was used because it was a softer sound than Zekrom's "Ze", as Reshiram is a less physically powerful character.
This Pokémon article is part of Project Pokédex, a Bulbapedia project that aims to write comprehensive articles on each Pokémon species, as well as Pokémon groups and forms.