theres more than 150 theres about 240 in sinnoh in national theres about 420 to se but sinnohs 240 :about: is included.
it depends on what you have on your pokedex Yu need to see all 150 Pokemon on the sinnoh dex to get the national dex, some of the Pokemon can only be seen from the Elite Four.
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.
for diamond and pearl there are 150 Pokemon u need to see . in plat nium u neeed to see 210 Pokemon.
See all 150 Sinnoh Pokemon
You need to get the national pokedex, which means that you need to see the 150 Pokemon in the Sinnoh pokedex.
Well if you mean National Dex then you need to see the 150 sinnoh Pokemon then go to Professor Rowan and he and Professor Oak will upgrade it
150 (and Manaphy, but you don't need to see or get it) in the Sinnoh Dex, and 493 in the National Dex. There should be 151 Pokemon in Pokemon Diamond.
You need to see all Pokemon in sinnoh
you have to see all 150 Pokemon in the sinnoh poekdex
See all 150 Pokemon in the Sinnoh Dex and talk to Professor Rowan.
you have to beat the e4 then see all 150 sinnoh Pokemon then talk to professor rowan
You have to see the 150 Pokemon in the Sinnoh region to get the National Pokedex in Pokemon Pearl. #151, Manaphy, is obviously not included. You also may be missing some Pokemon but havnt been to the Pokemon league there are several Pokemon there that are added in so check it out