Bea is the closest thing that Ash has to a rival in this series, so it would make sense that she would be the final hurdle before the Master Class.
One of the eight spots would go to Ash.
I think it’s going to depend on the structure of the Masters 8. If it’s a single-elimination tournament with traditional seeding, then he’d have to face Leon first in order to advance. I’m assuming Cynthia would be ranked somewhere around 4 or 5, so she would be next So it would be Leon, Cynthia, and then Lance, who is ranked second.
(If you’re not familiar with a ranked, single-elimination bracket,
you can see an example here)
If it’s random seeding, like the DP Contest Battles (which I think is more likely), then it would probably go Raihan, Cynthia, Leon.
Ideally, I’d like to see Ash battle his way through the entire Masters 8 to earn his battle with Leon. That would give Ash a chance to face off against all of the regional champions that he’s met along his journey.