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150 not including glitches.
catch all 150 original Pokemon i believe if not its you have to catch all of them from the hoen region too
Here is a list of all 150 Pokemon: http://www.serebii.net/diamondpearl/shinoudex.shtml The last Pokemon listed (#151) is not required to get the national pokedex.
150=tropius 152=absol 150=tropius 152=absol
150 hope i helped :) Actually there are 151 pokemon in the Sinnoh Pokedex but you only have to see 150 to get the National Pokedex.