Guys we need more brainstorming power >.<
If no one has certain data, go with ideas, I thought of petalburg maze as first place for latios / latias to spawn, there must be some other places fit to be a spawn...
So far:
- Sky Pillar
- Shoal cave - ice room
- Petalburg maze
are all places where you go once usually and then never go back there.
A good one could be somewhere where you can access only by diving, so the zone around soot / lilycove / mossdeep