Use ultra balls on all of them after weakening them and putting them to sleep except for Latios/Latias, you want to just use your master ball on him
Use pokeballs.
you can catch groudon in ruby in cave of origin then beat the elite four to catch rayquaza on sky pillar
If I remember right, its Latios,Rayquaza,Deoxys,Jirachi, and Groudon.
if you want to cheat to get all legendary Pokemon on ruby you have to play on the computer
You battle it and you choose whether to catch it or not.
i dont think you can, you can get the dogs only by action replay
you can catch lugia,kyogre,groudon,raykouaza,ho-oh,zapdos,moltres.articuno,and the three regis
You can catch Groudon,Rayquaza,Latios,Deoxys,Celebi,Jirachi,regiice,regirock,registeel,and Mew
Catch legendary pokemon, or just start over and play again.
just weaken it to the red and throw ultra balls
no.but you can trade it who someone who has it at firered leafgreen and yellow version......
you must defeat the elite four to do this... groudon:cave of origin rayquaza:sky pillar