You can see Garchomp from Cynhtia while you facing with her in the Pokemon league
you need to see 210, you need to see 150 for Pokemon diamond and pearl
national dex Pokemon are Pokemon from other regions. since most of the Pokemon you see in the game are from other regions i think like 1/2 of your national dex is complete when you get it.
get the National dex by seeing 150 Pokemon in Sinnoh or beating the Elite 4. FInd Rowan and Oak will burst through the door and upgrade your dex. P.S. You can see Palkia/dialga in celestic town in a book. That counts seeing the Pokemon.
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.
ok wow first of all i am marriland k and u have to get national dex (see al sinnoh Pokemon )to get past them u noob
first you need to get the national dex to do this you need to see all Pokemon in sinnoh to compleat the national dex see all Pokemon on the poke dex
150
You have to beat the Pokemon league and see every Pokemon in the sinnoh pokedex.
I'm not sure about catch but in the Sinoh dex you can see 150 Pokemon
150 then talk to Professor Rowen.
The good news is that you don't have to catch all the Pokemon, but you only have to see all the sinnoh Pokemon to get the national dex:)
To finish the sinnoh dex (Pokemon platinum's,diamond, and pearl dex) you just need to see every Pokemon not catch every Pokemon.
upgrade to the national dex and see and catch every Pokemon
You have to travel from the survival arena then climb up and that is how you get to stark mountain. (have to have the national dex) (see every pokemon in sinnoh to get national dex)
Talk to the Proffessor; he'll give you a National Dex.
no, to migrate Pokemon from the pal park you need the national dex =] Helb3nt12347
If you want to fill your Sinnoh Dex, look on websites. There are lists of where to see every Sinnoh Pokemon. If you want to fill your National Dex, you have to import them from your GBA games.