I don't think you can. Unless you somehow hack it. (Which is illegal)
Look on your map.
You can look up the pokedex for the hoenn region
since you have the national pokedex,go to grass to look for pokemon.or you can migrate.
go to serebii.net , they have pictures! :)
they can look like this:? and many more no they can look like any thing but instead black
a goldfish with black spots, a horn, and and a black and white giant tail
Beat all the Hoenn Gyms and Hoenn Elite Four and look in a water map. You will eventually get him. A tip if you want to catch Kyogre faster is to make a new account and only beat the Hoenn Gyms and Hoenn Elite Four. Then when you look in the water maps for Kyogre, you have a better chance to find it since there are less legendaries that can appear(only the Hoenn ones.) Best of luck finding Kyogre!
He looks all the same in all regions.
well it looks like a helmet with something kissing inside it.
first you pick treeko as your starter. then you beat the elite four. then you look around hoenn forhim
After beating the Pokemon League, go to your house and look at the TV show currenty on. Identify the mystery Pokemon on TV as blue, and Latios will be anywhere in Hoenn.
It looks bigger and it is standing straight up. The head changes to look a bit like a helmet.