>>54944367>what makes it so special?The limited roster ends up being a blessing. And all the viable Pokemon have multiple sets to pull from. Even plenty of UU mons have real niches in the tier. There is also no one thing that is overbearing. Even Salamence/Tyranitar after D-Dance is manageable thanks to a variety of checks.
The limitations also extend to held items with most mons picking from either salac, lefties or choice band. Most other item choices are super rare and niche and even then they don't dramatically impact the game the way things like items in later gens do. No U-Turn/Volt Switch is super nice too.
I see people mostly complain about chip damage namely in the form of spikes but Adv also has an abundance of fantastic spinners with only one spin blocker in the form of Gengar.
All of this culminates into a really well balanced meta and perhaps the most skill-based meta you can pick from.
TLDR: Wide variety in both Mons and sets without anything being overbearing.