This is a Malphirsian Plasma Phantom, aka a 19th System Rotom, from the Cosmic AU. Specifically, it is the Data Partner of Professor Oak. Professor Oak obtained it long before he got his Data Tracker licence, befriending it when it and others of its kind were migrating from system to system. Attracted by the energy from the energy core of young Samuel Oak's ship, it has since served both as Professor Oak's closest friend and as the navigation system for his ship (the vast power of the ship's core burns out conventional systems). Note that the Rotoms of this dimension can possess and empower virtually anything with a power source, not just appliances. The Data Monsters of this dimension speak a language understandable to most sentient species given time and practice and they in turn understand the languages of most sentient species. This is just one of many system variations of the Rotom found in the Cosmic AU, specifically the 19th System variation.
P.s. the design I used to make this Rotom is based of Ben 10's Upgrade Alien Form.
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I do not own Ben 10
I do not own pokemon.