Some believe that she's inferior to the likes of Clair, Juan, Volkner, Drayden and Wulfric...How did she get degraded? If this is about Ash not using Farfetch'd in the rematch with her, she didn't exactly go with Hawlucha herself, and her Grapploct took down Pikachu which is impressive since the only other pokemon who's beaten Pikachu this saga in combat was Leon's Charizard.
They have to... So we can expect that they're not some random CotD characters...that's the thing, the top 100 trainers are bound to be tough to the point where they ain't gonna be able to have things be as flexible with the first two tiers, that's why it doesn't bother me.
i'll say this though, if Ash faced Korrina to get in the great tier to begin with, i'm betting he'll face someone of importance to get into the ultra tier which i do look forward too.
Final obstacle in Great Class could be Gary or Iris, hoping it would be someone like Malva, Aaron or Phoebe though...