go through the caves in iron island
Byron the gym leader gives you one on iron island when you the national pokedex and there is also one in the iron island cave near exit
If you have the L100 Event Regigigas, it will be in the last room before the exit.
I'm not sure what your on about but the only secret in iron island would be REGISTEEL in the room near the exit but can only be found with an event REGIGIGAS. You can an item in that same room, I think it's the iron ball or something. Hope I helped =]
you have to go inside the dungeon on that island and find the exit on the other side
go through iron island with a person named riley and he will give you an egg after you help him get out from the exit (not the entrance).
there are actually 2 new moon and i forgot the other
Registeel's room is all the way at the end of Iron Island (the place with Riley). You have to get all the way through and it is right before the exit.
After beating elite 4 go to iron island. Go through the lifts to the exit. In the large room where the exit is there should be a new door. in side there is a pokeball containing the meatal coat
The Ellis Island exit was called The Kissing Post by staff who worked there.
you get him inside the little cave near the exit and you see dots on the floor and a statue.
Regice: mt coronet exit regirock:sand storm place registeel: iron island order: Regirock regice registeel
you go to iron island and go where you saw riley go in t lift and try another exit at the end you will find 1