Dropped by
Defeat or catch them. Chance per drop, and how many you get.
Wild Pals at Lv 70 and up: the World Tree · World Tree map
Wild Pals at Lv 80: the World Tree's Aura and top Pals · Aura spots on the map
The game picks a Pal's drop list by its level, so these drops only come from wild Pals at that level or higher. World Tree farming guide