No, the only legendary pokemon that can breed with a Ditto is Manaphy, to make the pokemon Phione
Groudon,Kyogre: The Cave of Origin;Sootopolis Rayquaza: Sky Pillar; Ocean Regirock, Regice, Registeel: Caves ; Regirock:Desert, Regice:Ocean, Registeel: Next to Lilycove
RAYQUAZA:SKY PILLAR KYOGRE:MARINA CAVE GROUDON:TERRA CAVE REGISTELL:ANCIENT TOMB REGIICE:(FORGET) REGIROCK:DESERT RUIN LATIAS/LATIOS:ALL OF HOEEN REGION JIRACHI:I DON'T KNOW
rayquaza, groudon, kyogre, latios or latias depending what color you choose after you beat the elite 4. The ancient Pokemon are anorith (evolves into armaldo) and lileep, and cradily. The Pokemon you can get from a cheat is mew, deoxis, and jerachi
latias/latios/deoxys/jirachi/groudon and kyoger
You can catch Rayquaza and i think groudon and kyogre to but im not sure. and if u have the eon ticket u can get to latios or latias (depends on wich game u have) thats all i know bye I KNOW more than that though. You can also catch Regirock, Registeel, and Regice.
ruby=groudon+raquaza+latios+the regis sapphire=kyogre+raquaza+latias+the regis emerald=raquaza+groudon+kyogre+latios or latias+the regis
Kyogre,Groudon, raquaza, Latias and (or) Latios
well this is my opion but the top 5 to me are Latias, Latios, Raquaza, Groudon, and Kyogre.
You can fight in the battle tower, catch the three regis, search for latios/latias, or in emerald you can catch groudon and kyogre
Here are some legendaries that I know and i hope that it would help. -Raquaza -Kyogre -Groudon -Latias -Latios
there are groudon, kyogre, raquaza, & regice regirock and registeal and mew and ho-oh and lugia and latias latios and deoxys
raquaza is at the sky pillar latias and latios will be found randomly kyogre is at the marine cave groudon is in the terra cave mew and deoxys are both at ilands
Deoxys, Jirachi, Latias, Latios, Groudon, Kyogre, and Rayquaza.
Kyogre, Groudon, Rayquaza, and latias or latios
For Pokemon ruby you can catch the three regis, rayquaza, groudon, and latios/latias. In sapphire you can catch the three regis, rayquaza, kyogre, and latios/latias. However, in emerald you can catch kyogre, groudon, rayquaza, the three regis, and latios/latias.
Groudon,Kyogre: The Cave of Origin;Sootopolis Rayquaza: Sky Pillar; Ocean Regirock, Regice, Registeel: Caves ; Regirock:Desert, Regice:Ocean, Registeel: Next to Lilycove
kyogre, groudon, raquaza, jarachi (I think), deoxys (I think), latios, latias, the three reggies (regigigas couldn't be caught) and some more. I think.