get the national pokedex
You get in on the giant island with the survival area after beating the Pokemon league.
go to the survival area, and explore!!!!
stark mountain
You need to see all 150 pokemon in the sinnoh region, after that you go see Dr.rowan and talk to him then dr.oak will come in and give you the national pokedex
Around Fight/Survival Area they will be lv.50
You go to the Survival Area and his house is on the left of the Pokemon center
you have to fight all the Pokemon trainers and then you go to proffeser oak and then you go on a boat to the survival area
North from the fight area, or south from the Survival Area.
Beat the Champion, talk to the boatman in Snowpoint City.
You must see all 210 pokemon in sinnoh and get the national pokèdex
he went to the home on the left of the Pokemon center in the survival area
You can't get Swablu in Sinnoh, apart from in the Battle Area, Resort Area, Survival Area etc.