This is an entry for Chibi-Matoran's Design a Pokebal Colour Contest.
Starter Ball: The starter ball could be the pokeball that your starter pokemon is in when you recieve it. It would make your starter pokemon look more special, but if you breed it, the pokeball the newly hatched pokemon is in will become a normal pokeball. If you trade it, then the other person will know that it was the original trainer's first starter pokemon, making it much rarer.