i've personally enjoyed almost every mini-game esque implementation in pokemon (pokemon stadium minigames, gen 3 contests, pokethlon), so assuming they're done right (and this is a rather big assumption to make), i don't see why this couldn't be fun.
to be honest? i really do miss mini-games in pokemon. gen 3 contests were the peak for me until gen 4 underground and pokeathlon and i feel like not as much focus has been given to minigames ever since. i suppose USUM's mantine surfing minigames sort of counts, but that novelty unfortunately wore off as people grew tired of gen 7 games as a whole.
really though, pokemon doesn't need to be about battling all the time! i think there's space for really well implemented minigames for the sake of relaxation and it's been done well in the past for the most part, no reason why it can't be done again. i say this but i haven't touched contests in particular ever since gen 3 (because that's the last time contests were fun for me), but idk, contests back then were more.... easier for me to understand, i suppose.