No trick, it's just pure luck. There's only a 1 in 8192 chance you'll run into one though.
This is the shiny Rapidash sprite, it's not purple.Luck.I have only come across 3.A purple flamed Rapidash,a green jeweled Tentacool,and a yellow Illusume.
The flames still aren't purple.FLAMED.I said purple FLAMES.Duh.
Crikey.
That's a teeny chance. =(
I only ever found one Shiny Pokemon.
Red Gyarados at the Lake of Rage is G/S/C.
=(