My favorite romhacks are usually the ones that bring about Fakemon. Getting a massive number of new Pokemon to battle with and learning all of the new types is incredibly fun. High effort ones are even more amazing and this is one of them. A downright absurd number of monsters are available, all with custom sprites, custom moves, and since it's built off Radical Red, you get a lot of quality of life features. Well worth a play if you like Pokemon and Yu-Gi-Oh.