Posted By: FishingFrenzie, if you have any questions, contact me at punted@live.com.au :D
You are not able to catch the regis in Diamond. You can catch them in the Game Boy Advance version of Pokemon Emerald.
no
you can only catch them in Pokemon emerald, sapphire, or ruby
You Can't
not. you will have to migrate them from emerald
no you do not just the Pokemon relicanth and wailord.
all i know is how to get the regis and latios or latias.
You don't need to go in any order.
For Pokemon ruby you can catch the three regis, rayquaza, groudon, and latios/latias. In sapphire you can catch the three regis, rayquaza, kyogre, and latios/latias. However, in emerald you can catch kyogre, groudon, rayquaza, the three regis, and latios/latias.
you can't- make Pokemon migrate from Pokemon ruby/sapphire/emerald or trade from diamond and pearl or platinum.
Rayquaza, Kyogre, Groudon, The Regis, Latios and Latias, and a lot more.
well, when you catch all of the regis in either Pokemon ruby, Sapphire, or emerald put them in Pokemon diamond or pearl using pal park and you will be able to find regigigas