How about Ash vs Lance

That too. It’s part of other.

Iris Vs Cynthia, Iris Vs Ash, Leon Vs Iris, Diantha Vs Iris, Iris Vs Lance, Lance Vs Diantha, Lance Vs Cynthia, Cynthia Vs Diantha, Leon Vs Plot Armor

Iris Vs Cynthia already happened. Unless they try a full battle this time in the next Master Class battle.

I'm not sure

^^I want a full 6v6

Hopefully the World Coronation Series continues in Generation 9 anime and hopefully Master Class has full 6v6.