It is like Everyone says there is a 1 in a 8,192 Chance of Encountering a Shiny Pokemon, I did manage to find More than 1 Rare Color on Platinum, My Real 1st Rare Color was a "Medittite" and this was on Platinum, and the other was in the same game same, saved State but there was a little bit of my own Error and Messed up Badly on Tryin to catch another Rare Color also this one was a "Buizel".
So In other and Conclusion Words there is More than 1 Rare color Pokemon's.
If there is a Comment about HG/SS about the "Red Gyarados" then that is just a Real Cuinsadince but not one of the Real Wild Rare Encounter in the Grass,Fishing,Caving in,Surfing in the Water/Stay in tall Buildings/Knock down Pokemon off the Tree/last but not least Getting your 1st Pokemon at Elm's Lab.