To help explain, which colour can be seen the most altogether on Pokemon and the Colour that is seen the least please. Thanks to whoever answers! :P
I can't really give an exact answer, but from what I've seen, reds, blues, and greens and even white are seen a lot though usually white is a minor detail. You probably won't see blacks or grays often though. I hope this answered your question.
Here is a list of all the Colours a Pokemon can have and the number of Pokemons have said colour. Blue 122 Brown 92 Green 74 Red 67 Grey 64 Yellow 61 Purple 58 White 45 Pink 37 Black 25 http://bulbapedia.bulbagarden.net/wiki/List_of_Pokémon_by_color
Well there are 9 different colour divisions according to bulbapedia and form what I can see the most common is Blue or Brown and the least is Pink or Black
Source: http://bulbapedia.bulbagarden.net/wiki/List_of_Pokémon_by_color Hope this helped!