So many of them are positively atrocious :X
Raichu, Sandslash, Wigglytuff, Vileplume, Meowth, Poliwhirl, Poliwrath, Alakazam, Machop, Machoke, Machamp, Victreebel, Hypno, Exeggcutor, Marowak, Lickitung, Eevee, Vaporeon, Jolteon, Dragonite, Mewtwo, Mew.
Seriously, Alazam looks anorexic. Mew looks like an abomination. The rest are so disportionate they make me ill.
Best sprite might be Pikachu, Clefable, Persian, Arcanine, Doduo, Muk, Mr. Mime or Magikarp.
We have come a long way since this lol