Run a couple of images of these pokemon through SpriteCraft or any other pixel art generating program and they will look 90% the same, Pixel art generating programs like SpriteCraft have a very distinct block placement, and unless gone over by hand and edited they stick out like a sore thumb and it is very obvious.
Real pixel art is built by hand, either taken from a pre existing sprite from a game/other or built right out of the ideas in your head.

(I chose not to use any of my pixel art at refrences.)
Real Pixel Art (Designed and Built by hand, with no programs.)
http://www.planetminecraft.com/project/all-pokemon-into-pixel-art/
http://www.planetminecraft.com/project/thor-1629164/
http://www.planetminecraft.com/project/sao-asuna/
http://www.planetminecraft.com/project/pokemon-art-665410/
http://www.planetminecraft.com/project/anime-babes-wall/

VS
Fake Pixel Art (Program Generated)
http://www.planetminecraft.com/project/justin-bieber-2111021/
http://www.planetminecraft.com/project/my-pixel-art-2205089/
http://www.planetminecraft.com/project/goku-755061/
http://www.planetminecraft.com/project/squibeel-pokemon/
http://www.planetminecraft.com/project/pokemon-charizard-1862420/

Please tell me you can see the difference. (I write all of this with no malice or intent to harm.)