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ok u need to defeat elite 4 and get national dex plus if u need dialga or viceversa go bak to cynthia's gran at celestic town and the middle house at the top of the town(the big 1) she will give u it on pokedex and if u need anythin else on pokedex i can help

hope this helps

The Pokemon in the Elite 4 are lots better than those on Ruby, Sapphire and Emerald for the Gameboy boost. Their Pokemon upward thrust as a lot as aspect 66 (Cynthia's maximum effectual) and the first few people have aspect fifty 3 to point 59 so pay attention. attempt to operate yours on aspect 55 a minimum of because once you've them at aspect 5 or decrease, then you extremely receives slaughtered. also, attempt to even out your crew's kinds. Your crew could include a hearth, Water, Grass, electric powered, Flying and a common/Psychic/scuffling with sort.

bostet7 is correct, you must beat the elite 4, then once have seen all 150 pokemon in the Sinnoh Dex you can visit professor Rowan in Sandgem Town (I think it's sandgem), and when you talk to him Professor Oak will visit and somehow the Pal Park will be opened for you.

defeat the elite 4 then u have to see all 150 pokemon

1. You have to defeat Elite Four

2. After the Elite Four you can get the national pokedex.

I hope that I helped.

You have to defeat the elite Four and get the National Dex.