I have played most Pokemon games, but I am deciding between Pokemon Sun/Moon/Ultra and Brilliant Diamond.
I have never played either of these games not even their original versions. What do you think?
Additionally, is Sun/Moon good or is the Ultra version better?
The others already answered your question, but since you said you thought pokemon games were too easy and you have a steam deck in other comments, I would recommend Pokémon reborn. It is a free fan game on PC. I play it on my steam deck and it is great for it. Just takes a bit of setup and configuration.
That game is challenging if you want something difficult. You really need to plan out your approach as only brute force attack moves will get you nowhere unlike brute forcing a normal Pokémon game.
Do with this information what you must.
Thanks! This might be what I am looking for in regards to a challenge. I have the site open, I will check it out in a few moments.