Try an editorial M-B team core in the builder, then adapt its members and moves for the current format.
Tyranitar's Sand Stream doubles Excadrill's Speed via Sand Rush and chips everything that isn't Rock, Ground or Steel. Garchomp takes your one Mega slot, Incineroar's Intimidate and Fake Out buy setup turns, and Gholdengo (Good as Gold) walls the status moves that would slow the sweep.
Two dragons apply immediate pressure with Extreme Speed priority and speed control. Gyarados takes the Mega slot for a Mold Breaker Dragon Dance, Incineroar keeps the tempo with Intimidate, and Kingambit closes — Supreme Overlord climbs with every fainted ally.
Mega Mawile's Huge Power and Fairy/Steel typing blanks the dragon-heavy meta while Sylveon's Pixilate Hyper Voice pressures from range. Corviknight and Gholdengo form the defensive backbone behind a Garchomp sweeper.
Trick Room flips the turn order for five turns — your slowest Pokémon suddenly moves first. Farigiraf sets it safely because Armor Tail blocks Fake Out, then slow wrecking balls like Conkeldurr and Rhyperior swing before anything else, with Armarouge carrying a backup Trick Room to reset the clock.
Every slot attacks. Grimmsnarl's Prankster gives Reflect and Light Screen priority, halving incoming damage for five turns while Volcarona (Quiver Dance) and Dragonite (Dragon Dance) set up behind the screens. Kingambit's Supreme Overlord closes exactly when the team needs it most.
Mega Kangaskhan spearheads — Parental Bond turns every hit into two, so Fake Out chips and Double-Edge hurts twice. Weavile's priority Ice Shard picks off weakened dragons, Garchomp and Volcarona provide secondary win conditions, and Gholdengo plus Corviknight keep it from folding to faster teams.
These links lead to current brackets and standings. For the in-game ladder, use the Champions usage hub.