200 species all though if you do the math yourself the actual hoenn Pokemon species count is 135 but the hoenn dex includes a few kanto species and johto species that's why its 200 instead.
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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 !!
when you complete it you get one of the jhoto startes.
I think you have to trade to see them. Actually, you have to trade to see lots of things in Hoenn. But it'd be worth it; you get a Johto starter for completing the Hoenn Dex.
You have to complete the Hoenn pokedex to get one from Prof. Birch. That includes catching all the Pokemon in there. This is impossible, but you can get a Johto starter if you finish your Hoenn pokedex and show it to professor Birch.
You will need to complete the Hoenn PokéDex then go talk to Professor Birch and he will give you the option of picking Cyndaquil, Chikorita or Totodile.