you can catch water Pokemon by surfing on water and by using all the rods
Trade from Colloseum or Five and six Island-----------------------------------------------------------------Remoraid can catch thru fishing using the super rod in Island 7.
Psyduck is in firered not leafgreen you can find it using a good or super rod in the safari zone.
You can get Poliwag by fishing (using the Super Rod) on the Elite 4 trail.
You can find it by using a Super Rod on Iron Island.
you can catch water Pokemon by surfing on water and by using all the rods
Here is the answer to your questionYou can catch all Pokemon on leafgreen by using Pokeballs to catch them after you battle them. Why don't you not be lazy and just catch them for yourself instead of using cheat codes when you do not feel like catching them.
Trade from Colloseum or Five and six Island-----------------------------------------------------------------Remoraid can catch thru fishing using the super rod in Island 7.
You can catch Lugia at Navel Rock.
Psyduck is in firered not leafgreen you can find it using a good or super rod in the safari zone.
If you are referring to Staryu, you can catch them in Pallet Town, Vermillion City, One Island, and Five Island by fishing using the Super Rod. Starmie can only be obtained by evolving Staryu.
wailmer and sharpedo
You can get Poliwag by fishing (using the Super Rod) on the Elite 4 trail.
http://www.psypokes.com/lab/shiny.php
you cant catch any starter without picking it as your first pkmn or using a code to get the one you don't have
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You must evolve Porygon (From Celadon) using the UpGrade to Porygon 2.