You need beat the Elite 4 and complete the Sinnoh pokedex. You just need to seen them all but the few pokemons are not used by trainers. These are the locations of the remaining pokemon to fill your Sinnoh pokedex.
00:00 Introduction
00:45 Mesprit
01:55 Azelf
03:30 Uxie
04:55 Manaphy
06:55 Rotom
08:20 How to get National Pokedex
09:42 How to get Pokeradar
How to Get Manaphy & Phion
▶ • How To Get Manaphy & Phione in Genera...
More details about pokemon pokedex locations
➡https://www.serebii.net/platinum/nati...
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#azelf
#uxie
#mesprit
#pokeradar
#nationalpokedex