Rayquaza, Kyogre, Groudon, The Regis, Latios and Latias, and a lot more.
With an ultra ball or master ball in sky tower. The name of it is Rayquaza :)
rayquaza,groudon,kyogre,regice,registeel,regirock,latios or latias.
The three legendary Pokemon in Pokemon emerald is Kyorge, Groundon and Rayquazer.
if you mean between kyogre and groudon, then the battle in sootopolis.
You can't catch one in Pokemon Emerald.
Yes, You can catch Groudon in Pokemon Emerald.
No you cannot catch Entei in Pokemon Emerald.
You can't catch a Bellsprot in Pokemon Emerald. You trade it from Pokemon Leafgreen!
catch it with a Pokemon (normal) buy like 50 or dive ball or master if there no other lengendary Pokemon
There are many Pokemon you catch that are similar in sapphire and emerald but there are many Pokemon emerald can only get and not sapphire.
Cressilia is a 4th generation Pokemon so you can't catch it in Pokemon Emerald.
You can't catch or obtain other trainers Pokemon in emerald.