Pokemon emerald questions:
Where can you find a shiney Pokemon?
A: Well, this Pokémon, the rarest of the rarest, can be found anywhere in the entire game in grass, seaweed, or the sea. Or on just the sky pillar and Mt. pyre floors.
Where can you find Deoxys?
A: You know those rumors where you can go onto the spaceship and number 56, right? Well, they are totally false, so do not believe such nonsense. Just go to a Nintento event of some sort, just don't go and grab a GameShark. Cheating are for babies, unless you are one.
Can you get Groudon? And if you can, where is it?
It is at Terra cave. To get there, go to the weather institute close to Fortree, where you got a Castform (Hopefully you have been there) and go to the second floor. Keep on going and talk to the guy that gave you a castform. When he tells you that a drought is happening on a certain route, go to the route as fast as you can, and try to find a hole that has not been there.