No it's pretty darn bad, but if it's for the sake of having Iris beat Dawn I'm OK with it. From a meta perspective, having Dawn beat 2 other heroines would be even more horrible. Therefore I'm content if Iris wins, no matter what ******** excuse they pull.
Kenta Miyake's also voiced Cyrus, Paul's Elekid, and some filler pokémon. Wouldn't seem very likely for any of them to appear though.
Chie Satou is the voice of Ambipom indeed. She's also voiced Ursula's gabite. That doesn't seem really relevant though.
Tooru Akiyoshi seems to be...
If they're doing the Enigma Stone Event, please, let Steven appear.
...He probably won't though. Steven will probably never appear in the anime ever again. All he'll ever have is that one shitty episode. And I'll never forgive the writers for it.