personally I hate these rival cards because they're just lazy. hop, tierno, nemona, etc could've been given decent effects, but were just relegated to draw 3 once a turn in a game with plenty of tutors and fixers. at least marnie and N did something different,
it's just skyla at a time where there's not as much of a need unless you play some gimmick deck like seek inspiration slowking.
I remember seeing them when I was a kid and I really don't like them and avoided all of the Delta Species packs if possible for some time.
they were their own thing apart from the anime and games, kind of like the early e-reader sets in terms of setting and art. I could see the connection between them and terastalization, but that was just a transformation gimmick for gen 9 following mega evolutions and gigantamax. I genuinely wish that they'd go back in that direction with creativity instead of adhering to just the videogames, especially when they waste good characters on era gimmicks.