They can be battled again if u haven't recruited them and u can also get the treasures again.
It is in a house on land. A treasure hunter (whom is dressed like a Pokemon ranger) in the house will give it to you. Depending on how you do it you can battled anywhere from 0 to 4 trainers. The egg has a Larvesta inside.
vs. seeker
You meet him in the distortion after you have battled with him twice
lance
nope
Ghestis disappeared after you battled him and N at the Pokemon League.
It can't because ive battled it before
You have to enter the Pokemon League.
you get the vs seeker
in Pokemon emerald,ruby,and sapphire is a surf away from where you first battled may
He is waiting in the battle area to the right of the Pokemon center.
no because my freind battled me and I used raquaza and he wanted one and it wasn"t in his national dex