Ability Spam
Premise:
Have you ever wanted to turn off your brain and simply spam broken mechanics onto your Pokemon? In Ability Spam, Pokemon can sacrifice their moveslots to run additional abilities, for example Dragonite can sacrifice one of its moves like Fire Punch to run Aerilate.
Rules:
Mechanic: Players can replace a number of a Pokemon's moveslots in exchange for an equal number of abilities.
Clauses: Standard OMs, Sleep Moves Clause
Bans:
Pokemon: Annihilape, Arceus, Baxcalibur, Calyrex-Ice, Calyrex-Shadow, Chien-Pao, Chi-Yu, Deoxys-Base, Deoxys-Attack, Darkrai, Dialga, Dialga-Origin, Dragapult, Eternatus, Flutter Mane, Giratina, Groudon, Ho-Oh, Hoopa-Unbound, Iron Bundle, Keldeo, Koraidon, Kyogre, Kyurem, Kyurem-Black, Kyurem-White, Landorus-Incarnate, Lunala, Magearna, Mewtwo, Miraidon, Necrozma-Dawn-Wings, Necrozma-Dusk-Mane, Ogerpon-Hearthflame, Rayquaza, Reshiram, Palafin, Palkia, Palkia-Origin, Regieleki, Shaymin-Sky, Sneasler, Solgaleo, Terapagos, Ursaluna-Bloodmoon, Urshifu-Base, Zacian, Zacian-Crowned, Zamazenta-Crowned, Zekrom
Abilities: Arena Trap, Armor Tail, Contrary, Comatose, Dazzling, Emergency Exit, Fur Coat, Good as Gold, Gorilla Tactics, Hadron Engine, Huge Power, Illusion, Imposter, Innards Out, Magnet Pull, Moody, Neutralizing Gas, Orichalcum Pulse, Parental Bond, Poison Heal, Primordial Sea, Psychic Surge, Pure Power, Queenly Majesty, Quick Draw, Shadow Tag, Sand Veil, Simple, Snow Cloak, Speed Boost, Stench, Stakeout, Tinted Lens, Unburden, Water Bubble, Wimp Out, Wonder Guard
Watchlist:
Dragonite, Gale Wings, Desolate Land, Magic Bounce, Supreme Overlord
Strategy:
Increased Viability:
Pokemon that mainly use only one or two moves benefit largely by being able to sacrifice their other moveslots for better abilities.

Being able to sacrifice Fire Punch and maybe even Earthquake for Adaptability and Aerilate allows Dragonite to become a dangerous setup sweeper with Extreme Speed.

Replacing Haze with Unaware and another moveslot for Corrosion allows Toxapex to threaten most Pokemon without enough offensive power.
Decreased Viability:
Pokemon that usually need all of their moves suffer by being unable to benefit from more abilities.

Kingambit usually runs Kowtow Cleave, Sucker Punch, Low Kick/Iron Head, and Swords Dance. Eliminating any of these moves would be detrimental to Kingambit as it would lack strong STAB, priority, coverage, or stat-boosting.
Q&A:
Q: Do different abilities (e.g. Filter and Solid Rock) stack with each other?
A: Yes.
Q: What happens if I replace all the moves on a Pokemon with abilities?
A: The Pokemon will be forced to use Struggle.
Q: Can I use the same ability on a Pokemon more than once?
A: No.
Credits:
yoko Notgamingreally Octosquid420 for helping me with the premise, banlist, and viability.