Pokémon: Bill Cipher
Type: Ghost/Psychic
Ability: Prankster / Analytic
(His ultimate form only has Bad Dreams.)
Moves: Telekinesis, Psychic, Psyshock, Psychic Fangs, Fire Fang, Thunder Fang, Ice Fang, Crunch, Shadow Claw, Shadow Ball, Dark Pulse, Mind Reader, Foresight, Taunt, Torment, Miracle Eye, Future Sight, Signal Beam, Thunderbolt, Ice Beam, Flamethrower, Thunder, Blizzard, Fire Blast, Sludge Bomb, Dazzling Gleam, Moonblast, Flash Cannon, Energy Ball, Solar Beam, Charge Beam, Thunder Wave, Will-O-Wisp, Toxic, Confuse Ray, Outrage, Protect, Double Team, Stealth Rock, Gravity, Stone Edge, Rock Tomb, Water Pulse, Growth, Minimize, Swagger, Mega Punch, Fire Punch, Ice Punch, Thunder Punch, Hyper Beam, Mean Look, Nasty Plot, Nightmare, Dream Eater, Hypnosis, Wake-Up Slap, Confuse Ray, Double Team, Trick Room, Wonder Room, Magic Room, Foul Play, Trick, Moonlight, Embargo, Iron Defense, Expanding Force, Poltergeist
Stats (Base form): 80/100/60/150/110/80 [BST 580]
Stats (With physical form; Holding the Dimensional Rift turns him into this form upon switch-in.): 80/110/100/190/120/80 [BST 680]
Reasoning: A Dream Demon from whatever Multiverse Gravity Falls lays in. (which may or may not include our own universe... oh dear) The dude's clearly nuts, and is quite the big-time prankster with a VERY dark sense of humor. Ghost/Psychic because he haunts dreams and knows "LOTS OF THINGS", to quote the thing itself. (Also he’s incorporeal pre-Weirdmageddon) He's focused on Special Attack because he's the master of Dreams, and come Weirdmageddon he can VERY CASUALLY rearrange people's faces. Still, while he's nowhere even CLOSE to his full power in the Dream World, he telekinetically yanked out a deer's teeth before returning them to the deer in question. Considering he's extremely powerful in the Dream World, he has all those moves on hand. However, once Weirdmageddon breaks out, Bill's immense power leaks into the Real World, and Weirdmageddon probably would've wrecked Earth if not for that barrier which stopped his progress. He even casually vaporized Time Baby, of all people! And Bad Dreams in his ultimate form because Weirdmageddon was caused via breaking a hole between dream and reality, and that he's still, well, a Dream Demon. Also he can apparently morph his eye into a mouth and at some point in Weirdmageddon became a giant red pyramid thing with two mouths (both across the entire body) in order to pursue Dipper and Mabel.