For the most part, the MonoGame version is the ideal one to use. However, we must also address the minority who have issues with this version, some of the issues possible include but are not limited to:- your video card doesn't support the version provided by the launcher- you have problems with some models on the game- get unacceptably low FPS under some situationsIf you are experiencing any of these problems, try the XNA version of the game (The XNAPokemon.zip file), just be careful since we do not usually recommend this in any other situation: https://github.com/P3D-Legacy/P3D-Legacy/releases/tag/0.54.1 , you will also need XNA Framework 4.0 to run the game in this format: https://www.microsoft.com/en-us/download/confirmation.aspx?id=20914 We ask you that you provide any feedback that would help us with fixing these issues in the future. If you wish to report an issue with the XNA version of the game, please report it here: http://pokemon3d.net/forum/forums/6/ and add [XNA] to your thread title.