A fan project, PokeMMO does not have an official launcher solution for the Macintosh OS X environment, instead instructing users to run the .sh file through a series of command line prompts through the terminal.
Not satisfied with this option, I decided to create a .app launcher for personal use, and an accompanying icon to go with it. In keeping with the source material, I styled my launcher's icon after the official branding for the Pokemon franchise.

Below, the icon can be seen as it appears in my OS X dock.