There is no time limit although the time on your trainer card stop after so much time
From my opinion, I think Diamond is. But, I think that if you start with Chimchar, you should play Diamond. If, you start with Turtwig, you should play Pearl. If, you start with Piplup, you should play Plantinum.
Only you can catch some only in Diamond and some only in pearl
You can't. Sinnoh is only available in Pokemon Diamond, Pearl and Platinum versions which are set in sinnoh.
yes its also the same for platinum diamond and pearl, but diamond and pearl do not have a battle frontier
doesn't matter, the only difference is the rare Pokemon (palkia for pearl and dialga for diamond) and you can only get stunky on diamond not pearl and you can only get Scorpio on pearl not diamond. Other than that they are both the same and both as good. hope i helped!
Yes, you can.
no.
The no$gba works pretty well Hey do u Play Pokemon diamond or pearl or that other game???
You cant get palkia in diamond if you play diamond and you trade you STILL cant get palkia only in pearl you can get palkia
I believe that Pokemon platinum is better than diamond and pearl because it offers more features, and allows you to do much more cheats and tricks and get more Pokemon through normal game play than Pokemon diamond and pearl. Yes, it is.
it depends on the game. If you play in Diamond, Pearl, or Platinum you have to level it up by one in mt. coronet. If you play on HeartGold or SoulSilver, you have to trade it over to Diamond, Pearl, or Platinum and do the directions above. Finally, if you play in white or white 2, then you have to level it up in chargestone cave
Really it depends on the game. Pearl you have to play through to get it. Diamond to my knowledge there is no way to get it.