Latias and Latios appear for the first time after you beat the elite four. Then, you just have to wander around in tall grass until it appears. I found that it's easier to do other things and stumble upon one of them randomly. Make sure your Pokemon has good speed because they flee after only one hit, sometimes not even.
Latios cannot be caught in Pokemon Diamond. You must get one off the GTS if it is in your Pokedex, or you must migrate it from Pokemon Ruby, Pokemon Sapphire, or Pokemon Emerald.
No you cant catch Latios in Pokemon Colosseum. You can only trade it in from your Ruby or Sapphire game in to the Colosseum game and that's the only way you can get it.
you cant dummy
Transfer from GBA via palpark
Pokemon ruby's version IS Pokemon ruby.
Arceus is not possible to find in Pokemon Ruby. It was released in 2007 with Pokemon Diamond and Pearl
You can find all kinds of pokemon.
You can't in ruby.
In the game Pokemon ruby destiny
Piplup is not found in Ruby.. Piplup wasn't created when they made Pokemon Ruby.
You can't find raikou in ruby.
First of all, please improve your spelling. Second, you don't FIND the Sapphire, or Ruby. There's Pokemon Sapphire AND Ruby.