Ivysaur, Venusaur, Charmander, Charmeleon, Charizard, Squirtle, Wartortle, Blastoise... Caterpie, Metapod, Butterfree, Weedle, Kakuna, Beedrill, Pidgey, Pidgeotto, Pidgeot... Rattata and Raticate, Spearow and Fearow, Ekans and Arbok, Pikachu and Raichu, Sandshrew and Sandslash, Nidoran, Nidorina and Nidoqueen, Nidoran (again), Nidorino and Nidoking... Clefairy and Clefable, Vulpix and Ninetales, Jigglypuff and Wigglytuff, Zubat and Golbat, Oddish, Gloom and Vileplume. Paras and Parasect, Venonat and Venomoth, Diglett and Dugtrio, Meowth and Persian, Psyduck and Golduck, Mankey and Primeape, Growlithe and Arcanine, Poliwag, Poliwhirl and Poliwrath... Abra, Kadabra and Alakazam, Machop, Machoke and Machamp, Bellsprout, Weepinbell and Victreebel, Tentacool and Tentacruel, Geodude, Graveler and Golem, Ponyta and Rapidash, Slowpoke, Slowbro, Magnemite and Magneton, Farfetch'd, Doduo and Dodrio, Seel and Dewgong, Grimer and Muk, Shellder, Cloyster, Gastly, Haunter and Gengar, Onix, Drowzee and Hypno, Krabby and Kingler, Voltorb and Electrode, Exeggcute and Exeggutor, Cubone and Marowak, Hitmonlee and Hitmonchan, Lickitung, Koffing and Weezing, Rhyhorn and Rhydon, Chansey, Tangela, Kangaskhan... Horsea, Seadra, Goldeen and Seaking, Staryu and Starmie, Mr. Mime, Scyther, Jinx, Electabuzz, Magmar, Pinsir, Tauros, Magikarp and Gyarados, Lapras, Ditto, Eevee, Vaporeon, Jolteon and Flareon... Porygon, Omanyte and Omastar, Kabuto and Kabutops, Aerodactyl, Snorlax, Articuno, Zapdos and Moltres... Dratini, Dragonair and Dragonite, then Mewtwo and Mew.
I don't think this thread will be all too practical, those are just the gen 1s.
Got brilliant diamond today from my parents, excited to play. Can bet I'll be hunting out Porygons, I love that little polyagonal feller.