In order to get the Hoenn Legendaries in Diamond, I went out and got myself a used copy of Emerald. Lucky for me, the (I'm assuming) girl who owned it before I did had already captured four legendary Pokemon, so she saved me a lot of trouble. My questions are mainly regarding the legendary pokemon that she didn't obtain.
First off, Marine Cave. Since Kyogre didn't show up in her Pokedex, I know it's still out there. I know what Routes it shows up on, from reading article on Bulbapedia, but is there a way of finding out where it's showing up without having to visit each individual Route to see if it's showed up?
Second, Lati@s. She had Groudon, so I know she's beaten the Elite Four already. Is there anyway to find out which one she selected before I encounter it?