/challenge gen1nu @@@ -Mr. Mime, -Charizard, -Clefable, -Blastoise, -Poliwhirl, -Kabutops, -Nidoking, -Moltres, -Venomoth, -Golem, -Kingler, -Exeggcute, -Seadra, -Raticate, -Porygon, -Wigglytuff, -Ninetales, -Nidoqueen, -Rapidash, -Arcanine, -Seaking, -Fearow, -Staryu, -Omanyte, -Machamp, -Abra, -Drowzee, -Vileplume, -Sandslash, -Pinsir, -Graveler, -Magmar, -Dragonair, -Poliwag, -Slowpoke
(everything else is bad or not in the tier)