Just throw pokeballs at wild Pokemon
now if your talking about rayquaza get it's hp down to 1 hp give it a status other than poison or burn use ultra ball for a while then use timer if it gets bad and laitos or latias don't use your master ball on them get sudowoodo(sorry if i mispelled) and put him in front then when you run into latios or latias use his move block(you get him at battle frontier you have to water him and be prepared he is lv40)
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Yes, You can catch Groudon in Pokemon Emerald.
You can't catch one 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!
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.