Every Pokemon is part of the National Pokedex because it is called the NATIONAL POKEDEX so every Pokemon has to be in there to complete you entire national pokedex. For instanceyou have Pokemon platinum you have some missing Pokemon such as misderaves and murkrow or stunky. The only way to complete your Pokemon dex is trade from all Pokemon games even gameboys or you can migrate from the pal park. So trade Pokemon that you don't have if you want it and your friend has a Pokemon that you want, and he doesn't want to trade for instance like arceus maybe if he doesn't want to give trade your Pokemon then trade it back it will also count as that you have it. HOPE I HELPED P.S sorry i didn't explain much about the mew I sorta got off track.
you cant because the only Pokemon gmes you can get them on withot cheating are the ranger games so you have to migrate or cheat.
Politoed is a national-dex Pokemon so it can only be obtained through a trade.
heatran in inside Stark moutain, which is only available after you get the national pokedex.
it only goes to 150 on the sinnoh dex........=l
witch one sinnoh or national if it is sinnoh u can only get when u have gone to the disstron world or if it is in national it is in mt . coronet
The Trophy Garden is the only place to get Ditto in Pokemon Platinum, without trading or cheating of course.
Currently only by cheating.
You can't, Celebi is obtainable by events. The only way you can find a Celebi in Pokemon Platinum is by cheating.
You can't. You can get it only through migrating, trading or cheating.
you can't get ho-oh in Pokemon platinum only by cheating with AR or r4 or migrate it of Pokemon gold
You can have the national dex, but you can't complete it without transferring Pokemon from GBA games. Therefore, it's impossible to complete the national dex using only a DSi (without cheating with an Action Replay.)
The only way to catch Arceus in Pokemon Platinum is by using the Azure Flute or cheating. The Azure Flute is an event item that sadly was never distributed. This means the only way to catch Arceus is by cheating.
You could only get Arceus through the event system, which means outside of cheating there is no way to get it currently.
Cheating. Just train your pokemon. It's much more fulfilling.
its easy to tell which one is platinum because platinum is the only Pokemon game so far that is the sinnoh region, yet it has every Pokemon... almost... ever made that you can catch without cheating.
you cant because the only Pokemon gmes you can get them on withot cheating are the ranger games so you have to migrate or cheat.
You can only do that by buying an action replay and entering a code titled "Catch trainers pokemon" so yes it can be done but only by methods of cheating.