What? That Mew is cool!
I can agree with the Green verion's Lizardon, though, but the new sprite is very bad as well. The only good ones were Blue and Yellow.
I like the old sprites better (not all, because some new are better), Ghose/Ghastly looks like a cannonball nowadays and the ghosts are purple instead of black. I think Ghost/Haunter looks like a shadow in the old games, don't know what it is in the new ones, but it looks less ghostly anyway.
One thing I like about the G/R/B/Y sprites is that they often look different from each others. For instance, a Green and Blue version's Lizardon/Charisard looks less alike each others than a Silver and Diamond version's do.
