I dont know about causing specific nests to spawn, but whenever I fight a monster I want, Im bombarding it with paintballs in the second half of the fight, that causes it to flee to its own nest that gets marked on your map. Paintballs are just as essential here as in the main games
Had to laugh last night, I had a sidequest to hunt a rathalos in Pondry Hills. Popped over there, couldn't see one, and thought it would be like the early game where my Peco summoned a Tigrex in the ice area. So we stand outside the forest entrance while my Peco shouts 'come and have a go if you think you're hard enough'. At which point we promptly get jumped by an Azure Rathalos. Surviving by the skin of our teeth, we try again. Deviljho turns up. I imagine my rider looking at the Peco and saying 'what on Earth are you saying!'
Enjoying this game so much, the mix of MH and Pokemon is really refreshing.