Pikachu of course, then he has caught pidove, oshawott, tepig, snivy, scraggy and sewaddle. As of July 17 2012: Pikachu Oshawott Pignite Snivy Unfezant Scraggy Leavanny Palpitoad Boldore Krokorok Confirmed for an evolution/Krokorok into Krokodile.
Pikachu,Oshawott,Snivy,Tepig,Pidove,And Sewaddle or however you spell it
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In the Unova arc of the anime, Ash's egg hatches into a Scraggy.
Including Genesect:-155 Pokemon in the Unova region.
he saw alomaloma ( or however you say it) is the first unova pokemon he saw
there is 160 pokemon
Not counting the pokemon from Unova, all of them but Raikou.