I have Eon ticket and mega latios but Norman isn’t taking me to southern island. Its hacked and the first thing in my inventory but it’s in the key items section it should work.
If that helped you figure out what was wrong, I'll post it as an answer.
This Reddit post says you have to have at least beat Norman, and obtained Latios and the Key Stone. According to this thread, if you use hacks to obtain event items, there are certain game states you might have to change. I don't know a lot about hacking so maybe this isn't any help.
You should go to the ferry guy with the Eon Ticket. He will drive you to southern island