Originally Posted by
Dhex
^ I agree with this;
"While regular marks denote enemies commonly found in the wilds of Eorzea, elite marks denote powerful enemies that only appear under certain conditions."
When you see "under certain conditions" in Maps/Leves/Quests/Sightseeing it's usually you travel to X place and activate the duty, emote in the right location, or wait for the right time/weather and emote.
I think regular hunt monsters will spawn when you emote in the right place; I think elite hunt monsters will require a party setup, time, location, and possibly weather to be spawned - but they will be locked by individuals/party.