I putted an Everstone on an Adamant Female Trapinch, while the male was Adamant too, and the baby had a Naive nature! What happened here? o_o'
On Ruby/Sapphire, you can hack the ticket, and successfully get to the island, but it will NOT let Latias/Latios be seen.
It works on mine. I'm on Southern island right now in my Ruby game, and Latias appears just fine. (same goes for Latios in Sapphire)