My favorite is an unofficial game: Pokemon Tabletop Adventures. I enjoy the setting, of course, and the system feels like it allows a lot of character development and progression both with classes and stats, where in other settings you're locked into your original character idea for the most part, in PTA it's entirely possible to completely take your character in a different direction at some point and still be somewhat decent at what you want to do. Plus, because of all the advanced classes and multiclassing being very easy, you can make dozens of different character concepts before you start feeling any bit of repetition.
It has a couple flaws, mostly caused by the differences between how Trainers and Pokemon are built. Trainers have the traditional D&D stats, and Pokemon have the Pokemon game stats, so when it comes to interactions with say Trainer Stealth vs Pokemon Perception, the Pokemon is always at a disadvantage if the Trainer has a Dex mod because the Pokemon get no bonuses. However, Pokemon seem to be getting traditional skills (Perception, Stealth, Climb, etc) in the next version, which I'd like to also see for Trainers honestly. Trainers also have no proper combat stats such as Defense, but it's kind of balanced out by their high HP (its rare for a Pokemon to have more HP than a Trainer). So they deal less damage unless their strength mod (or class specific stat for class abilities) is ridiculously high, and take more damage than Pokemon. It makes sense in the original context of Pokemon, but a lot of people really like focusing on Trainer Combat.
As for what they could do better, honestly just give PTA some love. The community seems to like the other version more (to me it's horribly dull in terms of character development and all the classes are completely underwhelming even if it does fix the above problems) so while PTU (Pokemon Tabletop United) is getting all these expansions (Sci-Fi, Legendaries as Deities, Game of Thrones) and homebrew stuff, PTA's ultimately incredibly ignored which only makes the community less interested because there's less content. It's really hard to even find a PTA game in the main community and sites like Roll20 don't even acknowledge it's existence like they do PTU.
My favorite is an unofficial game: Pokemon Tabletop Adventures. I enjoy the setting, of course, and the system feels like it allows a lot of character development and progression both with classes and stats, where in other settings you're locked into your original character idea for the most part, in PTA it's entirely possible to completely take your character in a different direction at some point and still be somewhat decent at what you want to do. Plus, because of all the advanced classes and multiclassing being very easy, you can make dozens of different character concepts before you start feeling any bit of repetition.
It has a couple flaws, mostly caused by the differences between how Trainers and Pokemon are built. Trainers have the traditional D&D stats, and Pokemon have the Pokemon game stats, so when it comes to interactions with say Trainer Stealth vs Pokemon Perception, the Pokemon is always at a disadvantage if the Trainer has a Dex mod because the Pokemon get no bonuses. However, Pokemon seem to be getting traditional skills (Perception, Stealth, Climb, etc) in the next version, which I'd like to also see for Trainers honestly. Trainers also have no proper combat stats such as Defense, but it's kind of balanced out by their high HP (its rare for a Pokemon to have more HP than a Trainer). So they deal less damage unless their strength mod (or class specific stat for class abilities) is ridiculously high, and take more damage than Pokemon. It makes sense in the original context of Pokemon, but a lot of people really like focusing on Trainer Combat.
As for what they could do better, honestly just give PTA some love. The community seems to like the other version more (to me it's horribly dull in terms of character development and all the classes are completely underwhelming even if it does fix the above problems) so while PTU (Pokemon Tabletop United) is getting all these expansions (Sci-Fi, Legendaries as Deities, Game of Thrones) and homebrew stuff, PTA's ultimately incredibly ignored which only makes the community less interested because there's less content. It's really hard to even find a PTA game in the main community and sites like Roll20 don't even acknowledge it's existence like they do PTU.