well, if it's a good post and a not rare pokemon, i will consider making it a shiny. if it's a rare pokemon then you need a really good post. If I give it a good egg move, It will most likely be allowed to be shiny. When The PC system comes up, I'll explain more. (I really don't want a team of 6 shinies for anyone.)
[EDIT] If you don't want a pokemon to be shiny then it doesn't have to be. it's your choice!