Gen 9 Monotype is a Smogon format where every Pokémon on your team must share at least one type with the rest of the team. You choose a type and build a full 6-mon team around it. Battles are 6v6 singles with Terastallization legal, and the format has its own banlist maintained by Smogon's Monotype council.
Strong types in Gen 9 Monotype include Dragon (Dragapult, Iron Valiant, Roaring Moon), Water (Primarina, Toxapex, Barraskewda), Steel (Gholdengo, Kingambit, Corviknight), Fairy (Flutter Mane, Clefable, Primarina), and Ghost (Dragapult, Gholdengo, Flutter Mane). Each type has different strengths and common weaknesses that shape the team-building process.
Yes. A dual-type Pokémon like Garchomp (Ground/Dragon) can be used on a Ground-type team or a Dragon-type team, as long as at least one of its types matches the type you chose for your team. This makes dual-type Pokémon especially flexible in Monotype.
Gen 9 Monotype bans all Pokémon banned in standard OU, plus additional bans specific to the type-restricted format. Some Pokémon are banned because they are too centralising within a specific type — for example, certain Legendaries or type-exclusive broken interactions. The Monotype council publishes the current banlist on Smogon.
Start by choosing a type you enjoy, then identify the best offensive and defensive Pokémon of that type. Build around a primary win condition, add entry hazard support, hazard removal, a speed control option, and at least one Pokémon that handles your type's most common weaknesses. Browse the teams on this page to see current archetypes for each type.
Click any team card to open it, then hit the copy button. Open Pokémon Showdown, go to the Teambuilder, click "Import from text", paste the team, and save. Select Gen 9 Monotype as the format.
This page shows Monotype teams shared on crob.at by the community. Official sample teams and viability rankings for each type are posted on the Smogon Monotype forum. The Pokémon Showdown Teambuilder also includes curated Monotype samples.