For the Regi's Catch a wailmor and a relicanth. Evolve the wailmor. Put relicanth first in your party and wailord last. Go to the regi cave. Talk to the main thing in brail and it should shake. Now the three regi pokemons cave's are now open. For registeel caves use fly in the middle of his cave. For regice Just sit and read the message fore 5 minuts and it should open. For regirock go right right down down and use strength. For the legendary bird Latios/Latian Beat the elite four and walk in grass because they appear randomly. For rayquaza Beat the elite four and get the mach bike. By the second gym leaders town there will be a sky tower. Get on the mach bike and maneuver around the cracked floors. Bring about 10 timer balls and 40 ultra to each battle. For Groudon or the sapphire version use the master ball u get in the team aqua/magma hideout.
Random Facts 200 of the original pokemon aren't in ruby/saphire You can mate the guy you get in the beginning with a similar looking pokemon to get a baby torchic/treeko/mudkip