I think that Moltres, Pinsir, Articuno, Venusasur, and Pidgeot all had a very strange sprite for Red, Green, and Blue. They all look so weird.

Moltres look's nothing like that at all
Pinsir has small eyes
Articuno just looks weird
Venusaur I can't even see what that is at all
Pidgeot's sprite only shows it's wing and a little of it's head