Brings back the innocent days.
Looking at this(without delving into criticism)reminds me of the old days when it was only 150 that you had to get and that they didn't start shooting off in the stupidest directions to try and make some. God, I couldn't even get some of these guys. The only complaint I have is having two different grass Pokemon. Bulbasaur can get souped up into some real nice evolution forms, but Tangela looks a helluva lot cooler. If I had to kick one, it'd be Tangela, alas. Evolution over looks.
Looking at this(with delving into criticism), the variety of colors makes it pleasing to look at, jumping from one image to the next. I like how each of them have a certain expression, either facial or body language, to them , giving them a personality that can be easily linked to them based off of what the games gave you. I have no real complaints about this picture except for maybe Haunter. He does follow the ghostly appearance rather well, but it looks like you put in a bit too much of the wackiness rather than the ghostliness. Outside of that, there's nothing else that I feel needs changing in this picture.