Hoopa is a relic of an age long dead, engineered by SILPH for a specific purpose forgotten (buried) long ago but it still performs with consistency. Hoopa represents the peak of SILPH's ghost experimentation that, ultimately, cost them more than they'd ever admit, with the Pokemon's loss heralding a slow decline that would close out a history of retroactive embarrassment. The Pokemon was believed to have died in a catastrophic failure of one of its rings generations ago, but has recently been proven to still be alive and active. This news has sent shockwaves through the conglomerate, who has begun to act desperately in attempts to remove the colossal apparition from the wild for the sake of public safety.
Hoopa is a giant of constantly regenerating prenatal flesh and crystalised dimensional slag. It possesses a unique power that permits it to transport objects of any number and size distances of any length in the blink of an eye. Like all ghost-types, it resides on multiple dimensions at once, with only a portion of it existing upon the third dimension - the dimension observable by human beings. The portion (extrusion) that rests upon the third dimension, a mere fraction of the Pokemon's size and power, is known as "Hoopa Obscured". The full body of Hoopa that resides within the Crossway, the mire between dimensions within which all ghosts walk, is known as "Hoopa Revealed". Hoopa Obscured is a mere foot and a half tall in the third dimension, while Hoopa Revealed exceeds 21 feet.
This Pokemon is known for its kleptomaniacal behaviour. It will steal things that attract its attention, but what actually attracts its attention in the first place is entirely unknown. Hoopa will go out of its way to search for and steal items of a very specific aspect (specific serial numbers, specific materials of X% content, sizes, weights, year of creation, diameter, and etc.) and hoard them in "treasure piles" in closed off or abandoned places formerly occupied by people. Should these piles ever be found or disturbed by human hands, the Pokemon will abandon them.
Hoopa is very shy; however, it is not cowardly. It will always attempt to flee before any notice of it is taken, but will stand its ground when discovered. If it feels it has not been fully seen and recognised, it will vanish. If it believes it has been fully observed and is under pursuit, it will take one of two actions: it will either abduct whoever observed it, or attempt to "put the enemy to sleep". Hoopa does not understand "death" as a status, and does not recognise the physical signs or symptoms of "harm". To this end, it will fight with full force and deal fatal damage to whatever it is striking at. It recognises blood as a symptom of pain, but not what it represents as an indicator of individual health. Hoopa engages in what it believes to be equal in what it experiences in battle. The foetal figure of Hoopa Obscured is delicate and easily damaged - any sensation felt via the extrusion will be felt by Hoopa Revealed in appropriate proportion (ex: a pinprick upon the hand of Hoopa Obscured will be transferred as a proportionately sized hole in all three hands of Hoopa Revealed on the same side of the body).
Hoopa is one of the few Pokemon confirmed to be literate. How well it can read is unknown, but assumed to be, at minimum, the equivalent of a young adult. It can comprehend signage, iconography, serial numbers, and reference systems / indexes. In terms of literature, it is unclear whether the Pokemon is "read" in a general sense, or is familiar with the concept of fiction / fictionalisation. Its lack of recognition of death suggests either its literary exposure has never encompassed wider, generalised literature, or it was purposefully redirected in its understanding so the concept never made a mark upon it.
