In Pokemon diamond you finish the main story after you beat the Elite four and champion. But after you get access to an island where there is something called a battle frontier, you can battle other people in that game and collect battle points. I don't believe the pokedex collects data from there but who knows i might be wrong. The main idea they are trying for you to do is finish the National Pokedex which contains 493 Pokemon, you need all the game boy advanced Pokemon games and some trading with your friends.
Hope that helps =)
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you have to get to pal park after you beat the elite four
yes its called migrating but in order to get your old Pokemon to get on your diamond you must first see all the Pokemon on diamond and peal. ounce you have all the Pokemon from d and p you have to put in your old gba game in the slot and at the start screen you will have the option to migrate the Pokemon. (you must have a original ds or a ds lite because the dsi does not have a gba slot)Jay1997 here. If u have ralts on a Pokemon diamond/pearl game, and not on another, then u don't need the national dex, just do a normal tradeI agree with Jay on this topic. i had a blaziken in my diamond version that had beat the game, and i traded it to my diamond version that hadn't beat the game yet, and all was fine
Go to herthome and beat the gym master -Game master
you can go after the legendary pokemon, or beat him again.
You can not buy Pokemon from the game corner in Pokemon diamond, but you can in heartgold and soulsilver