they are the three legendary pokemon of rock, ice and steel. they are know as regirock, regice, and registeel. you can find them in Ruby, Saphire, and Emerald.
Regirock, Regiice, Registeel, Rayquaza, Kyogre, Groudon, Latios or Latias
Only regirock, regice, registeel is available in Emerald
Regice, Regirock, Registeel, Latias, Latios, Mew, Rayquaza, Groudon, Kyogre, Deoxys and Jirachi. Your Welcome
Groudon, Kyogre, Latios/Latias, Rayquaza, Regirock, Registeel, Regice, Mew and Deoxys (event only's)
Deoxys, Latios, Latias, Rayquaza, Groudon, Kyogre, Regice, Registeel, Regirock, Mew, Ho-oh, Lugia
Regirock, Regice, and Registeel.
you cant only migrating them and catching them in pal park ruby sapphire emerald and maby more
latias,latios,rayquaza,kyogre,groudon,regirock,regice,and last but not least registeel unless you have a mystic ticket from and Nintendo
Trade for them
There are 11 legendary Pokemon (that I know of) they are Rayquaza, Groudon, Kyogre, Celebi, Deoxys (defence type), Ho-Oh, Lugia, Regirock, Regice, Registeel and Mew.
No. In emerald, you can still catch ho-oh, lugia, regirock, regice, and registeel. Ho-oh: Navel rock Lugia: Navel Rock Regirock: Desert Ruins Regice: Island Cave Registeel: Ancient Tomb