The Mega Evolved form of Celebi bears a striking resemblance to both a humanoid and a feline, with an all‑silver-white body accented by purple eyes, tail, and underbelly. A network of extracorporeal neural fibers extends straight from the center of its back, reaching all the way to the base of its neck, while its fingers are composed of three spherical segments. The Mega Evolved Mega Celebi X introduces distinctive elements such as a “hood” and “rugby gear,” while Mega Celebi Y boasts a diminutive, almost “infantile” physique—its oversized head adorned with protuberances that resemble “headphones.”

Celebi was created by recombining the genetic blueprint of Mew. Although Celebi’s genetic makeup is nearly identical to Mew’s, its size and personality differ in ways that are nothing short of astonishing. It emerged as the culmination of decades of relentless, albeit horrifying, genetic research conducted by a certain scientist. Celebi’s unparalleled power exists solely for the purpose of combat; its fighting capabilities have been pushed to the absolute limit, leaving it with little desire beyond defeating the enemy before it. To maximize its strength in battle, Celebi remains motionless, silently storing energy at all times. Legend has it that Celebi harbors the most ruthless heart of any Pokémon ever known. While human scientific ingenuity can craft its physical form, it cannot replicate the gentle, compassionate heart within. Today, it is said to slumber deep within a hidden cave, far from the world.

The muscles on Mega Celebi X’s body have been amplified by its immense spiritual power, granting it a grip strength of 1 ton. It can sprint 100 meters in just 2 seconds. Though Mega Celebi Y is smaller in stature, its raw power is virtually incalculable—just a slight exertion of telekinetic force is enough to reduce even towering skyscrapers to ash.