Okay this is nuts I know but I spent the last three days and a half completing in the Battle Tower to exchange for the items that I might need for the tournament. Now it turns out that I can't join due to me overtraining my Pokemons. Great, all of my Pokeys are in their level 70s and all of them are all above 50. >.<" I should have stop training by the time I hit the Ghost gym since it was then that most of the Pokemons are in their level 50 and below. Besides training, I went on a major catching Pokemon mode in order to complete my national dex.

The phrase 'Gotta catch them all!' had became a thing that I would never achieve unless I completed the last few remaining last spots. These missing pokemons are Darkrai, Shaymin, Cresselia, Giratina, Regigigas and Heatran. I could not find them throughout the entire Sinoh region and thought that they might be diamond exclusive.

Does anyone know where can I get them? And do I have to beforehand before they appeared?