Pokémon: Barney the Dinosaur
Franchise: Barney & Friends
Ability: Magic Guard | Unaware | [HA] Magic Jars
Signature Ability: Magic Jars (On switch-in, this Pokemon summons Rain Dance, Sunny Day, Sandstorm or Hail according to the held Rock item (Damp Rock for Rain, Heat Rock for Sunny Day, Icy Rock for Hail and Smooth Rock for Sandstorm. This ability also renders the user immune to powder moves and damage from Sandstorm or Hail. If the user holds no item, an item that isn't any of the before-mentioned ones or can't replace the current weather (Desolate Land (Harsh Sunlight) and Primordial Sea (Heavy Rain) for example), Barney triggers a Cloud Nine effect on the switch, removing the weather's effects).
If Deerling or Sawsbuck are around on Barney's switch and he's able to trigger a weather, Deerling/Sawsbuck will change form according to Barney's called weather:
Summer: Sunny Day
Moves: Celebrate, Soft-Boiled, Wish, Weather Ball, Heat Wave, Earth Power, Light of Ruin, Moonblast, Substitute, Minimize, Teeter Dance, Psychic, Whirlwind, Teleport, Sappy Seed, Sparkly Swirl, Defog, Bulldoze, Stomping Tantrum, Earthquake, Draco Meteor
Stats: 90 / 75 / 65 / 120 / 142 / 80 (572 BST)
Reasoning: Barney is a Dragon/Fairy type out of being a dinosaur that abuses sparkles, which are often related to Fairy types.
Magic Jars comes from Barney's episode 1-2-3-4 Seasons, in which Barney manipulates the weather to play with the kids, Celebrate comes from Barney often doing parties and all, Soft-Boiled, Wish, Telekinesis, Psychic, Whirlwind, Defog, Light of Ruin and Sparkly Swirl come from Barney being able to abuse sparkles/light for this sort of purposes to a degree, he can also blow well, plus some stretching here and there to be able to have on the meta something to replace Clefable, while also holding extra things to fit in a team, all Ground type moves come from Barney being able to do earthquakes by jumping, Teleport comes from Barney being able to... teleport (He does this quite often), Sappy Seed comes from Barney being able to make a tree grow in seconds, while also granting him a more potent variant of Leech Seed, Teeter Dance comes form Barney being able to make others dance alongside him, Draco Meteor comes from basic Dragon type STAB, plus all Dragon types get it regardless, Substitute comes from the "Doll" form he can access, which he does in every episode, Minimize comes from Barney being able to change the size of things (Evansion clause bans this anyways) and Weather Ball comes from Barney's weather powers.
Overall, Barney has plenty of potential in many sorts of teams, leaving weather teams at a side, Barney's defensive typing and stat spread allows him to be able to tank multiple hits, heal status off later with Sparkly Swirl as needed and stall out with Sappy Seed and Soft-Boiled, run an offensive Magic Guard Life Orb set with Light of Ruin, sets abusing Z-Celebrate or be able to quickly phaze opposing Pokémon that got out of hand with setup thanks to Unaware by using Whirlwind, also including hazard cleaning via Defog.
Lastly, for the abilities:
Magic Guard comes from Barney being able to use magic, and to allow him to be able to use Light of Ruin without recoil damage.
Unaware comes from Barney easily ignoring things and moving on.
Lastly, Magic Jars comes from the before-mentioned episode, 1-2-3-4 Seasons, where Barney can change the seasons, and with them the weather.