No it's a completely different set of NPCs with the "Teammates" trainer class models. You don't even battle themThey wouldn't happen to be Mysterious Sisters Scall & Ion, would they?
Either little sis is just embarrassed about her need of training being loudly announced and we just have our heads in the gutters, or this is a major yikes.
In any case, Sea Mauville is a pretty spooky place, as is its RSE counterpart to a lesser extent. It makes some sense for a Hex Maniac and her Fairy Tale Girl sister to be chilling there, though that doesn't explain Young Couple Lois & Hal (Kira & Dan in Emerald).