A high-quality porn parody of the Pokemon games that really take its core mechanics seriously. The gameplay is exactly what you'd expect from Pokemon, and is nostalgic in all the right ways.
The quality of the art varies pretty dramatically; some of it is quite excellent, particularly in the still CG scenes that sometimes crop up, but some of the Pokemon, including iconic characters, can be really rough (or missing entirely) from the main sex mechanics, the post-battle sex and sex in the bedroom. The limited animations would be helped with some more poses for our protagonist, if not the other girls; as it stands, it requires a lot of imagination to keep things interesting.
The writing is good and, again, appropriate to the Pokemon universe. It doesn't outstay its welcome at any point. That being said, there really should be more of it, not in terms of the novellas some game devs put into sex descriptions, but just more unique stuff. Other than a single trainer, all of the sex descriptions are the same, with only Pokemon with knotted dicks getting a different description from the rest. More unique descriptions, like lines from the trainers, genital/size-specific descriptions, etc. would all help a lot.
All in all, a great game that's mostly held back by the repetition of its adult content. Hopefully this will expand over time, and then we'll have a real gem on our hands.