Kyogre and regirock-regice-registeel
Mesprit Azelf Uxie Palkia
You can catch Latias
You can't catch Groudon in Sapphire. Groudon is avaible only in Ruby and Emerald.
You can't catch Rayquaza in sapphire or Ruby without beating the Elite four, but in Emerald you can. Sky pillar wont be there in Ruby and sapphire before you beat the Elite four. The only thing there is deep water. (If you don't believe me go take a look.)ture its stuiped
Not including the legendaries and special pokemon ( ones that you can only catch once ) feebas is the hardest and rarest pokemon to catch
Yes you'll still have the same Pokemon
1.eat pie 2.Watch tv 3.USE A POKEBALL
In sapphire you cant catch it without events or cheats:-)
you have to migrate from a gba game like sapphire you can catch a linoone in sapphire then migrate it to diamond at the pal park after beating the pkmn league
you don't need legendaries to catch other legendaries. just get a team of Pokemon around the level of the legendary you are trying to catch. weaken it until it is about to faint, and if you can put it to sleep or paralyze it, do that. then just keep throwing ultra balls until you catch it. just in case you don't catch, i recommend saving right before you start a battle with a legendary.
with poke balls
The legendaries you can catch in Pokemon Ruby without trading or going to an event are Groundon, Rayquaza, Latios, Regice, Regirock, and Registeel.