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There is a patch for Pokemon Emerald with all the 1st, 2nd and 3rd pokemon. Nothing with all the 493 yet
493 different ones, but for all in total... Unknown.
you cant you cane only get about 300 different pokemon
493. You have to trade with other games if you want to catch 'em all.
Bulbapedia has an alphabetical list (article title "List of Pokemon by Name").