Two-Ring Circus

Name: Hoopa
Pronouns: it / its |  they / them
Species: Hoopa
Form: Confined (it can turn Unbound but always chooses not to)
Height: 0.5m
Team Accessory: Rings (NOTE: part of the Pokémon's normal design would not usually be an admissible accessory; Hoopa is an exception)
Type: Psychic | Ghost
Nature: Sassy
Characteristic: Mischievous
Ability: Magician
Can easily steal items a target is holding, using its rings as portals.
Moveset:

• Hyperspace Hole [Psychic] [Special]
  Reaches through its intact ring to strike the target from behind - this is also how it travels between dimensions.  The far side of Hoopa's portals may take up a different appearance.

• Shadow Ball [Ghost] [Special]
  Conjures a blob of shadows and sends it floating eerily toward a target - the shadows pass through them, dealing damage.  It can also use this to muffle small light sources.

• Signal Beam [Bug] [Special]
  Fires a flashing beam of strange light from the small ring on its forehead.

Personality: To those who don't know it well, Hoopa is quite enigmatic.  Its constant mischievous smile could be a clue, especially as Hoopa often pulls pranks on those around it - it seems to be pretty cheeky, and pulls silly faces a lot.  Despite its aloofness, Hoopa came up with the Hyperspace tournament.  It's unclear how seriously Hoopa can take anything - but it is very protective over its expedition teammate Merriweather.
To communicate with her, Hoopa will gesticulate in exaggerated ways, pull zany faces, and make small sounds.
It hates any Pokémon other than Merriweather transforming into / casting an illusion of its appearance, and will grow aggressive if it sees this occur.

Virtues: 

• Observant - good at noticing potential dangers.

• Brave - believes in itself and will face challenges of any size.

• Trickster - adept at causing distractions.

Flaws:

• Nonverbal - cannot speak to others, so communication is difficult for it.

• One-eyed - has no depth perception and a limited field of vision due to the loss of its right eye.

• Tender scars - touching the right side of its face will cause Hoopa searing pain.

• Damaged ring - its right ring is damaged, useless, and crumbling; Hoopa will stop at nothing to protect it from further damage.

Backstory: Although a mythical Pokémon with unique and strange powers, Hoopa struggled for years due to its inability to speak.  It met Merriweather two years ago, and the two bonded in times of great distress.  She took the time to learn Hoopa's non-verbal methods of communication, and encouraged it to use its abilities to help people.
It has explored the multiverse for a long time, but distant dimensions are tricky to reach.  In dimensions unlike its own (those which house any creatures other than Pokémon), Hoopa can only safely create one-way Hyperspace Holes for non-native beings to travel to its home; however, recently Hoopa managed to create a bi-directional long-distance portal to the human world (our world).  This took a toll, and it lost an eye, horn, and irreparably damaged its right ring - this portal can be opened just one more time for a brief moment, to allow the winners of the Hyperspace tournament to travel through.

NPC Role: Hoopa will be providing transport via its rings to round locations and back to base camp in its pocket dimension.  It handles tournament logistics with Merriweather.

Name: Merriweather ("Merri")
Pronouns: she / her
Species: Zorua
Form: Unovan
Height: 0.8m
Team Accessory: Neckerchief
Type: Dark
Nature: Jolly
Characteristic: Somewhat of a clown
Ability: Illusion
Can cast illusions which cause herself to look like other nearby Pokémon - these wear off if she is touched.
Moveset:

• Sucker Punch [Dark] [Physical]
  Anticipates an opponent's movements and dashes beneath their guard to strike.

• Hyper Voice [Normal] [Special]
  Inhales deeply and shouts - when used combatively, its power shakes the target's bones and causes their ears to ring, but she may also use this to project her voice.  If terrified, Merri will use this move to drive perceived threats away.

• Grass Knot [Grass] [Special]
  Presses her paws into the earth to stimulate rapid growth in blades of grass which tangle and can trip a target.  She may also use this to wrap small objects.

• Sunny Day [Fire] [Status]
  Concentrates hard to clear the sky above her and those nearby.

Personality: Curious, goofy, naïve, and bouncy, Merriweather's boundless energy excites some and infuriates others.  Though Hoopa started the Hyperspace tournament, she seems to be the face of the operation, bubbly and welcoming toward all who enter its pocket dimension.  Despite this, she is jittery and anxious - when particularly scared, she will instinctively cast an illusion of either someone she can see or someone she knows well.  When startled, she takes a long time to calm down, but Gran's cooking never fails to soothe her nerves.
Oddly, she almost never refers to other Pokémon who share an expedition team by name individually when both are together.  For instance, if she saw both Gran and Dora in the same room, she would simply greet them as "Grand Aid".

Virtues:

• Charismatic - effective at winning people's good will - either because she is deemed entertaining, cute, or pitiful.

• Optimistic - keeps fighting even when things look grim.

• Patient - is willing to wait for a good outcome in most situations.

Flaws:

• Naïve - very easy to fool: not critical of others' actions unless they hurt her friends.

• Unobservant - distracted by her tournament duties and keeping things in order, she might fail to notice immediate dangers.

• Sensitive - criticism cuts her deeply, and she will often break down crying when bad things happen.

Backstory: Though she will gladly tell the epic tale of when Hoopa rescued her two years ago, the details change every time.  Merri seems hazy on the story of her life prior.  She has spent every second since then working to help other people in dimension after dimension, and is delighted that the Hyperspace tournament will allow an expedition team to venture to a distant world.  She loves Hoopa, Grand Aid, and Purrmageddon dearly, and co-operates with them efficiently.

NPC Role: Merri is the friendly face of the tournament - she's more or less the HR department, complaints office, and receptionist. She handles tournament logistics with Hoopa.