In order of appearance

Bikanel Desert, Oasis
Besaid, the Beach
Guadosalam, a chest inside Ormi's Room
Calm Lands, riding a chocobo at the Gagazet entrance (four and five)
Thuner Plains, Tower Nine
Kilika, the outlook, requires you go into the forest and find a ledge that prompts you to go up using the Circle button
Mt. Gagazet, the Summit where you fought Seymour's third form in FFX
Kilika, Dona's house
Bikanel (Cactaur Nation), in the sanctuary of the forgotten Cactaurs