They seem to be trying to see how far they can have the girls get away with 'falling upward' this series, get loads of power boosts and conveniences and almost systematically avoid showing them do ANY training or developed battling (as in against an opponent that isn't the equivalent of an inanimate punching bag). It stands out against Kiawe who has had to utilise trial and error and expand his style and tactics intricately with each of his episodes otherwise he lost, while the girls just seem to skip all that. No learning defensive techniques, no learning offensive for that matter. Hell Mallow's barely learned how to GIVE COMMANDS in battle, Tsareena and Shaymin mostly just do their own thing.
I could say this might come back to haunt them in the league, but the show has NEVER had a trainer NOT be good at battling by the end of their run, even Serena was just abruptly fluent and confident in battle strategies in her last battle despite doing only relatively better experience wise. Also it feels like this series is systematically avoiding getting the girls be in any situation they'd get their ass kicked, even if they HAD to lose for once, I get the feeling they'd want them to look as strong or brief a loser as possible.
If the girls are pit against each other, I can see it being a case of whose plot armour will run out first. At least two of them will have to ultimately sell a hit and struggle and, dare I say it, GET KO-ED, no matter how much they exaggerate their experience level here (unless they pull a Serena and get thrown out of the fight prematurely without having to actually lose).