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.
Personally, if I'm starting a solo world, I modify the pixelmon.hocon file to guarantee shiny starters, and choose which shiny starter I feel like starting with - in my case it's usually Froakie, Mudkip, Fennekin, or Charizard since I love their shinies (and I tend to prefer Mudkip or Fennekin).
If you really have a starter you want to use that isn't a traditional starter (say, Dratini), you can modify the pixelmon.hocon file to remove one of the starters listed and add your own.
Whatever you choose to do, HAVE FUN!