Is there a way to port a Pokemon Map from Platinum/Omega Ruby over to Garrys Mod?I know how to extract the models and vonvert them to .smd/.obj but how can I convert them into a working Gmod map ?
It depends. If you can get the textures for both the models and the said map, then it should be possible. After that it's just a matter of hand-creating a replica of the Pokemon map. I'm not very good with advanced Source/Hammer brushwork, so I'm way unqualified. Your best bet is to learn how to use Hammer.