Deoxys

Deoxys (デオキシス, Deokishisu, pronounced /di'ɑks.ɪs/) is an extravagant mutation caused by exposing a specific extraterrestrial virus to a laser beam, although why this mutation takes place is not understood. They utilize psychokinetic powers combined with a high intellect. Its "brain" is in the form of a crystalline organ embedded in its chest, which is capable of firing lasers - perhaps due to its aforementioned psychokinesis. Its most useful technique however is the ability to morph between four different forms, each with its own unique purpose: its so-called "Normal" form, both an offensive and defensive form, as well as one for speed. It appears that the exact extent at how easily a Deoxys may switch between forms entirely depends on the individual - while some are forced to only change while in contact with the meteorites from the same origin as themselves, others can do so at will; others cannot change between forms at all. This is very likely due to the mutative properties of the laser's effect upon each virus, as mutations are very rarely always the same.

Other abilities of theirs include the ability to create shadow copy drones, regenerating missing bodily components, launching auroras into the sky, and erecting city-size EMP force fields to force machinery within the sphere of influence from continuing operation.

Trivia

 * In early 2005, NASA began a cross-promotion with Nintendo and the Pokémon Company to provide an "edutainment" program for children across the United States by internet, teaching the science behind various Pokémon characters as they appear in Trading Card Game expansions. In the first segment of the program, based on the newly-released EX: Deoxys Trading Card Game expansion, they used the character of Deoxys to teach children about outer space, anatomy of a virus, the meaning of DNA, the existence of the ozone layer, and a definition of an extraterrestrial.  Since then the program has had two other segments covering the next two expansions: EX Emerald and EX Unseen Forces.
 * Deoxys also appears in Super Smash Bros. Brawl as a Pokeball Pokemon. It flies to the top of the screen and fires a thin, but highly dangerous beam downward.