Metagame premise: Types get 'banned' at the start of the game depending on the name of the first Pokemon you switch in.
For example, if your first Pokemon is a Coalossal who's name is 'Rock', the Rock type will be banned that game. If a Pokemon or move is Rock type, it will be changed to typeless instead. This means that Coalossal becomes effectively a mono-Fire Pokemon, and any Rock moves that exist will be changed to typeless instead, meaning it can effectively remove one of it's own weaknesses as well, while also removing a possible attacking type.
But this is just a light idea, as I think there's a lot to think about in terms of balancing.
Potential Strategies: I'm not quite sure! Like the example, Pokemon who are weak to a type may appreciate the removal of it, especially if it can help in multiple ways as it would with Coalossal. Alternatively, Pokemon who hit for immunities may also become better, as they could be named to ban said types from the game. Even if not removing an immunity, removing a resistance can also be effective. Landorus-Therian, for instance, could ban the Flying type by being named Flying. This changes it somewhat defensively, now having a Rock resistance, no longer immune to Ground, and less weak to ice, while becoming neutral against fighting. Offensively, Landorus can use Earthquake without worry anymore. On the topic of hitting immunities, you could name Pokemon according types so that moves such as Volt Switch, Nuzzle, Rapid Spin, Scorching Sands, and Future Sight can always at least hit a target, making them harder to play around.
Type-dependent strategies such as Weather or Terrain may become lesser in use, due to it being easier to ban those from the game, thus making abilities such as Drizzle, Steelworker or Psychic Surge much less useful.
Questions for the community: Should Pokemon be able to be named 2 types (Rock/Water for example) to ban instead? This could increase the number of possible strategies created, but can also make games somewhat less useable for your opponent. The only reason I ask this though is that Pokemon have up to two types, and for this meta it would stand to make sense then that up to 2 types can get banned. (With this idea, you could still just ban 1 if you want.)
How does this metagame sound in terms of fun? I think the most challenge comes at team preview, where you really need to gauge what types your opponent may ban in order to win the game.
For example, if your first Pokemon is a Coalossal who's name is 'Rock', the Rock type will be banned that game. If a Pokemon or move is Rock type, it will be changed to typeless instead. This means that Coalossal becomes effectively a mono-Fire Pokemon, and any Rock moves that exist will be changed to typeless instead, meaning it can effectively remove one of it's own weaknesses as well, while also removing a possible attacking type.
But this is just a light idea, as I think there's a lot to think about in terms of balancing.
Potential Strategies: I'm not quite sure! Like the example, Pokemon who are weak to a type may appreciate the removal of it, especially if it can help in multiple ways as it would with Coalossal. Alternatively, Pokemon who hit for immunities may also become better, as they could be named to ban said types from the game. Even if not removing an immunity, removing a resistance can also be effective. Landorus-Therian, for instance, could ban the Flying type by being named Flying. This changes it somewhat defensively, now having a Rock resistance, no longer immune to Ground, and less weak to ice, while becoming neutral against fighting. Offensively, Landorus can use Earthquake without worry anymore. On the topic of hitting immunities, you could name Pokemon according types so that moves such as Volt Switch, Nuzzle, Rapid Spin, Scorching Sands, and Future Sight can always at least hit a target, making them harder to play around.
Type-dependent strategies such as Weather or Terrain may become lesser in use, due to it being easier to ban those from the game, thus making abilities such as Drizzle, Steelworker or Psychic Surge much less useful.
Questions for the community: Should Pokemon be able to be named 2 types (Rock/Water for example) to ban instead? This could increase the number of possible strategies created, but can also make games somewhat less useable for your opponent. The only reason I ask this though is that Pokemon have up to two types, and for this meta it would stand to make sense then that up to 2 types can get banned. (With this idea, you could still just ban 1 if you want.)
How does this metagame sound in terms of fun? I think the most challenge comes at team preview, where you really need to gauge what types your opponent may ban in order to win the game.