I'm assuming you mean Porygon. Porygon evoles into Porygon2 then into PorygonZ. It evoles into both of them by being traded with an item. Porygon=porygon2 traded w/ upgrade, Porygon2=PorygonZ trade w/ dubious disk
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If you don't have an action replay, other games, wifi or the GTS the Pokemon you cannot get are: Bulbasaur and evolutions, Charmander and evolutions, Squirtle and evolutions, Mewtwo, Mew, Chikorita and evolutions, Cyndaquil and evolutions, Totodile and evolutions, Raikou, Entei, Suicune, Lugia, Ho-oh, Celebi, Treecko and evolutions, Torchic and evolutions, Mudkip and evolutions, Latias, Latios, Kyogre, Groudon, Rayquaza, Jirachi, Deoxys, Murkrow and evolutions, Misdreavus and evolutions, Trapinch and evolutions, Clamperl and evolutions, Glameow and evolutions, Stunky and evolutions, Darkrai, Shaymin, and Arceus
azumaril bidoof bibaral crogaunk' drapion skorupi carnivine psyduck golduck Roselia budew marill Also if you have a super rod you can get a carvanha and a whiscash And you can get a eggxecute or w/e and a brown and green spotted mushroom looking thing (the brown and green spotted mushroom lokig thing is actually a shroomish)
It's cool pokemon that can evolve into a bunch of other cool pokemon, but it's far from being the best. It's evolutions aren't the best either.
The Pokémon Egg Groups are Undiscovered, Human-Life, Water 1, Water 2, Water 3, Mineral, Amorphous, Monster, Bug, Flying, Field, Fairy, Grass, Dragon and Ditto, the Pokémon that are listed in the Water 1 group are Poliwag and its evolutions, Clamperl and its evolutions, Mantine, Palpitoad, Tympole, Seismitoad, Froakie and its evolutions, Squirtle and its two evolutions, Lapras, Omastar, Omanyte, Seel, Dewgong, Golduck, Psyduck, Dratini and its evolutions, Marill and its evolution, Totodile and its evolutions, Wooper, Quagsire, Remoraid and its evolution, Corsola and Slowpoke as well as its two evolutions.
at http://www.serebii.net/pokedex/ you can find all the pokémon, with their evolutions and shiny colour. (left picture/sprite is normal colour, right picture/sprite is shiny) hope this helps =)