Mami will request a Fairy-type little amulet called a Soul Gem (...heh heh) that can restore the PP of her attacks if she draws upon it, but it has to be recharged by keeping it out in the sunlight for awhile.

Estelle will get a small yellow-brown gem built into a metal bracer, which is a Ground-type thing. She can cause a minor earthquake by punching that arm into the ground, now.