The summon beasts in ff7 are materia to collect just like the other materias in the game. So heres where to find them.
Talk to the chocobo at the first chocobo farm you went to first and reply by saying "Waaark"
At the Junon coast after saving Priscilla
On the boat just after beating Jenova-Birth
Lying on the floor in the Chocobo jockey waiting room
In the wreckage of the Gongaga reactor
