Deoxys
Deoxys is the “DNA” Pokemon that appears as a legendary monster in the Ruby and Sapphire franchise. Players could not simply catch the monster in the original game as they would need to get a special item known as the “Aurora Ticket” through a Mystery Event. However, Deoxys was later worked into the Omega Ruby and Alpha Sapphire remakes for the 3DS. It is a Psychic-type that has an alien-like design that isn’t limited to its specific form.
The monster also lives up to its reputation as a Legendary Pokemon through its devastating moves like Psychic and Psycho Boost. In ARMS, Deoxys can easily extend its arm-like body parts as a weapon to hit foes. The Pokemon could also have a special Forme Change ability similar to how Shulk can change his arts in Super Smash Bros. on the Wii U. Deoxys would start off in its Normal Forme and will later have access to Attack, Defense, and Speed depending on the damage it’s dealt. The Attack Forme could enhance its strength at the cost of defense while its Defense Forme would make it immune to certain knock backs in exchange for speed. Lastly, the Speed Forme could give it the ability to double jump and evade blows faster at the cost of power. Deoxys would be best-suited to players who have a good understanding of the game, while wanting a more diverse playstyle.