Hi,
The chances of getting Kyogre is very likely. In my game, he joined on the second time i versed him, so it will probably be the same for you.
Shadowfritsch4
Chat with our AI personalities
You have to beat team aquas leader. His red orb will glow and kyogre will wake up.
Alakazam, Groudon, Rayquaza, Kyogre, Swellow, salamance.
Kyogre is pretty easy to recruit, because he might join your team on your first try, but if not, you can always try again. Make sure you have a Friendbow and/or a high team rank, like Gold or Diamond rank.
Zangoose, the rival of Seviper, is in Emerald, Ruby, and Saphire. Zangoose is also in Mystery Dungeon Red Rescue Team and Blue Rescue Team.
You can't sadly.