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You can only complete the national dex in pearl with action replay cheat codes. No, actually you can without cheat codes. Go to Barns&Nobles to buy the Pokemon DP guide book 2!!!NOT BOOK 1! Then it has full pokedex. Then follow it by duel slots, trade, pokeradar, migrations, etc.
I'm getting there in SS. ive got over 320 and am currently playing platinum so i can trade pokemon over. i wont be getting a few of the event pokemon though.
I've got it done on Blue, Crystal, and most recently Platinum. Of course, Platinum is the only one of those games that I still have and still works, so needless to say I'm keeping it around for awhile.
I didn't play R/B/Y or G/S/C, and it was just waaaaay to difficult to do it in R/S/E since there was no Wifi. And in DPPtHGSS there are just too many pokemon for me to even bother trying.
I could probably have done it if I wanted to (since I have Wifi + a Johto + Kanto game (SoulSilver) + a Hoenn game (Emerald) + a Sinnoh game (Platinum)) but I find it boring and a waste of time. All you get is a stupid diploma and a star and a changed color on your trainer card and that's it.
So no, I haven't, because I don't see the point in doing it.