This site is not for solicitation of services or 'purchasing' development. Please do not post requesting side mods/plugins and so on. Your thread will be removed, and you will receive a warning.
If you want to get more creative than that, you can set the "starting area" as a biome that doesn't generate naturally (Extreme Hills Edge/Frozen Ocean) and use Spawn of Psyduck or database editing to define which Pokémon can spawn in that biome.