you'll have to go through the whole process of capturing the regi's (regice, registeel, and regirock)
watch "how to get the three regi's" on youtube
in mauville desert route 111 it only works after you have unlocke the sealed chamber
You can,but you have to have a connector.
pokemon ruby is better than sapphire by far
You must have 2 Game Boy Advances or Game Boy Advance SPs and a link cable for the GBA. Once you have both games up and running, both characters in both games have to go to a Pokemon Center. Then, go...