Something I didn’t include in my Pokémon Stadium pitch is that in order to participate you’d have to sign up for it. Like I said it would basically be a daily tournament with a winner at the end and could be watched like a show as well with AR tech bringing the battles to life. It wouldn’t be the only attraction and I feel like it would be popular.
For participation you’d either use Pokémon you caught or “rentals” provided at the attraction. Pokémon Home connectivity could be an option but after thinking about it that could offer a very unfair advantage so maybe that could be limited and only offered during some kind of special event or not at all.