You get a diploma, gold trainer card and if you talk to prof birch you can get a johto starter pokemon.
U Will Need Gameshark Codes To Complete The Pokedex In Pokemon Emerald.
If you complete the pokedex you can get a johto starter from prof birch you also get a gold trainer card and lastly the grand daddy of all prizes a diploma for your hard work.
you complete the national pokedex
pokedex or National
http://www.serebii.net/pokedex-rs/
when you complete it you get one of the jhoto startes.
To complete hoenn pokedex you do not need JIRACHI & DEOXYS at all.you can't get all Pokemon on Pokemon emerald so TRADE or CHEAT !!
In emerald if you complete the pokedex you can get Chikorita, Cyndaquil and Totodoile from prof birch.
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Last time I checked, only in Emerald did you have to capture every Pokemon for the PokeDex to be complete.
complete the pokedex then talk to profesor elm.
Emerald.