Deoxys does not evolve and does not have a pre-evolved form.
Deoxys takes on four different forms. All four have one common thread: the main body has a meteor-like sphere in its chest and strand-like arms that resemble a strand of DNA.
The Normal Forme has one of its strand-like arms form a hand, while the other flaps more loosely. Its head appears somewhat normal. The twin strands that make up its arms intertwine on each side when it enters its Attack Forme, and its head, torso and legs look more menacing. The Defense Forme sees the twin strands bulk up in mass, along with the rest of Deoxys, a Forme that can withstand more attacks and take more damage. Lastly, the Speed Forme is the slimmest of the four formes, as its arms go down to only one strand each, the rest of its body becomes streamlined, reducing wind resistance to allow it to go faster than its other Formes.
Deoxys is a Genderless Pokémon.
How Deoxys Changes Formes
The form that Deoxys takes depends on the game in Generation III. It takes on its Normal Forme in Ruby and Sapphire, its Attack Forme in Fire Red, its Defense Forme in Leaf Green, and its Speed Forme in Emerald.
A different way for Deoxys to change formes was introduced in Generation IV. In Diamond, Pearl, and Platinum, four Meteorites are on the ground in Veilstone City. With Deoxys in your party, check each stone to change Deoxys' Forme. These stones also appear in Heart Gold and Soul Silver, but are located in the southwest corner of Route 3 near Pewter City; these meteorites function the same way as they did in Diamond, Pearl, and Platinum.
Like Mew, Celebi, and Jirachi, Deoxys is only available through promotions from Nintendo, Special Events, or as a Wi-Fi Download. In Emerald, Fire Red and Leaf Green, the way to access Deoxys is to find access to Birth Island by way of a special Nintendo Promotion.
In Generation IV, a Deoxys could be obtained by way of a Nintendo Promotion or via Mystery Gift download via Nintendo Wi-Fi.
A Level 80 Wild Deoxys awaits at the climax of Delta Episode, which occurs in Omega Ruby and Alpha Sapphire. One of the challenges of this battle is that Rayquaza will have Mega Evolved beforehand, preventing the usage of Mega Evolution.
The rarity of Deoxys carries over to the Spin-Off games as well, only appearing at Mr. Who's Den in Pokémon Trozei!.
Deoxys can be found on the 20th Floor of Meteor Cave in the first run of Mystery Dungeon games. Deoxys is found on the 23rd Floor of Final Maze in Explorers of Time, Explorers of Darkness, and Explorers of Sky Deoxys is available on the 17th Floor of Simmer Hill, but a Stone Plate or Mystery Part is required (the items go by the names of Secret Slab or Enigma Part in Explorers of Sky). Deoxys is exclusive to Stormy Adventure Squad in Mystery Dungeon 3, appearing on the 18th Floor of Mystery Marsh, but as it was in Explorers of Sky before it, a Secret Slab or Enigma Part is required to find it.
Deoxys can appear at Crocoa Tunnel in Pokémon Ranger, but only during an Event Mission. Under normal circumstances Deoxys doesn't appear in Pokémon Ranger: Guardian Signs. But it does appear in an Event Mission, which takes place in the Odd Temple. The mission is titled Deoxys & The Mysterious Temple. While an S Rank is required to get Deoxys, there's one catch: this is a Co-Op Mission, and and the Past Missions don't use Nintendo WiFi--a second player is required at the minimum to activate the double switch in the second room.
Deoxys can be found at any of the "Factory" stages in Pokémon Rumble Blast after completing the game, and any one of Deoxys' formes can appear as well.
Trading Card Game
Deoxys appears in a total of 18 Sets, the 7th Movie Halfdeck (3), Pokémon Organized Play Series 4 (2 Rare Cards; 1 Delta Species & 1 EX Card), a Pokémon Card Game Promo, the 10th Movie Commemoration Set, and a special Rayquaza and Deoxys Legend Card in the Undaunted Set.
Deoxys is listed as a Rare Card in the EX Deoxys (6; 3 EX Cards), EX Emerald (2; 1 EX Card), EX Holon Phantoms (4 Delta Species Cards), Legends Awakened (4-one for each Forme), and Call of Legends (2; 1 Secret Legend Card) sets.
Deoxys is one of the Pokémon that appears from a Poké Ball in Super Smash Bros. Brawl. It flies up a short ways before firing a Hyper Beam downward. Any opponents that get caught in this attack get knocked back very far, possibly KO'd.
Deoxys has only appeared in the Wild thus far in the Anime. Max and Meowth would get captured by a Deoxys in the episode Pokémon Ranger! Deoxys Crisis!, forcing Ash and Solana, a Pokémon Ranger, into action. Pikachu and Piplup would also encounter a Deoxys in the episode Cheers on Castaways Isle!.
Two Deoxys would be stolen from the Mossdeep City Space Center by Team Rocket. The Deoxys known as Individual 2 would escape, but Individual 1 would be captured and used by Team Rocket to ambush the Pokédex Holders from Pallet Town, particularly Red. It worked, and as a result Individual 1 was abandoned.
Individual 1 appears in Chapters 269-271, and appears in a flashback in Chapter 296.
After its capture, Individual 2 would be used by Team Rocket and its leader Giovanni to try and defeat Red, who would partner with Mewtwo for this battle. While Mewtwo won the day, Deoxys would help to stop Team Rocket's Airship from being destroyed mid-air, and would escape the clutches of Team Rocket with Mewtwo's help.
The beam of light that was intended for Deoxys, which exploded as a result of Mewtwo's attempts to counter it, had a side-effect: it left Red, Blue, Yellow, Green and Silver petrified.
This Deoxys would make a number of appearances starting with Chapter 275 and officially concluding with Chapter 302, appearing once more in Chapter 414 in a flashback.
In Generation VI, all Deoxys forms reside in the Uber Tier. Deoxys-Attack has amazing offensive stats along with a high 150 Speed. It is an absolute nuke with Psycho Boost and has an expansive offensive movepool to give it optimal coverage against the majority of the metagame. Deoxys-A can also act as an entry hazards lead with Spikes while having greater offensive prowess than its Speed form, who performs a similar role. Deoxys-A has awful defenses though and will be easily destroyed by any attack, so it is hard to switch in.
Deoxys-Speed has a blistering fast 180 Speed that allows it to function as one of the best entry hazard leads in Ubers. Since it is not as frail as Deoxys-A, Deoxys-S can set up more layers of Spikes when functioning as a hazards lead. Its advantage over Klefki, another common Spikes setter, is its access to Taunt to shut down users of Defog from removing hazards. Deoxys-S only belongs on one specific archetype in hyper offense, but its ability to set up hazards without much trouble frees up Primal Groudon in terms of more offensive sets like a Rock Polish set. Deoxys-S lacks much offensive power and is bothered by the presence of Magic Bounce Pokemon such as Mega Sableye and Mega Diancie, although it can circumvent this issue with Skill Swap.
Deoxys-Defense and normal Deoxys both lack niches in the Ubers metagame, but both are too centralizing to be in the Overused metagame. Deoxys-Defense has a bad defensive typing that leaves it susceptible to the common Dark and Ghost attacks, a disappointing Speed stat by Ubers standards, and no real standout resistances. Normal Deoxys is outclassed by Deoxys-Attack in an all-out attacking role and outclassed by Deoxys-Speed in a hazards setting role.
Omega Ruby/Alpha Sapphire
Deoxys cannot breed and therefore doesn't have any Egg Moves.
Via Move Tutor (Omega Ruby/Alpha Sapphire)
Generation III Move Tutor
Via TM/HM (All Formes)
Via Move Tutor (All Formes)
Heart Gold/Soul Silver
Via Special Methods
NOTE: Both of these moves come from a downloadable multiplayer mission in Pokémon Ranger: Guardian Signs by completing the Odd Temple Mission Deoxys and the Odd Temple.
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