>>39456686While it's not one to one with pokémon (Gameplay wise), Persona and Shin megami tensei has creature capture mechanics and each creature untilises a range of different special moves, passive skills, etc,. The only thing those games lack is online (so battling, trading, etc.) and if you want a game with a more similar tone to pokémon but made for a more mature audience there's always digimon cybersleuth and hacker's memory