Send in an unequipped Sigurd and seize Ayra's castle. Enemy phase, she'll try to atttack Sigurd, but neither will likely die.
Then have Sigurd talk to her.
it ONLY works if you've conquered Ayra's castle first.
This.
Also, you know those trainers with pokemon that have a "normal" level for your team to fight?
Like a pokemon trainer has one level 28 pokemon.
Then another trainer has two level 24 pokemon.
And then you see a fisher with six level 15 magikarp. <-- screw this.
Yeah seize both.
Woods, Forests, whatever, just concentrate on making your way toward Marpha (or whatever that last castle is, and you'll get Diedre.
GET LEX THE HERO AXE.