If the flawless Timid Reshiram is shiny, then I think it can't be legit as Reshiram, Zekrom and Victini can't be shiny yet... Sorry for saying something thats off topic.
the reshiram is not shiny, he just hasn't made a seperate section for non-shiny flawless pokes yet. so some of the flawless pokes on the list may not be shiny, however most of them are.