[quote=@MissFortune]
[@Heckno12]

There are some Pokemon that don't even look shiny *cough* Shiny Haunter and Gengar *cough*
[/quote]

Mega shiny Gengar does.

Another one that doesn't look that different is the Garchomp line. I remember getting a shiny one at the end of BW2 from Alder's grandson, and I didn't even know it was special till like a month later.