Had some ideas and the first is for Fezandipiti.
Since in bulbapedia it says that she wanted to be beautiful she would then want people to see her and not take their eyes off her so a possible place the MC could meet her at a pole dancing club (or strip club) where she would be the focus of attention where both men and women cant take their eyes off her. I do know of an animation that could help Chainsaw with this scene if they would like me to put a link to it.
Another idea is that the MC would have to find and collect the Loyal Three first before being able to find Pecharunt since the three were connected to her and thus together would be able to find her.
A small idea I had would be that the MC turns on a global news on the ship and would hear a little of how the region is doing now that the legends for it are gone. Some examples would be for region 1 not much has changed since the legends did not really effect the area. Region 2 could be that Ho-Oh's tower became a viewing area for sunrises and sun-sets since it would look like her flames in the distance. Region 3 would tell that the weather is more stable less hot sun and less heavy rain with weather lasting longer since Rayquaza is not there to clean up the weather. Region 5 would tell that Meloeta is on a world tour with a baby bump spotted. The news could be reported on by a big breasted news reporter that the MC could potentially meet (I have no idea who).