Yes theres summons, four of them and they are:
Adrammelech (a dragon like summon that appeared in Final Fantasy Tactics)
Velius (was an enemy in Final Fantasy Tactics..very similar looking to a ram)
Ifrit (pyromaniac demon from the past Final Fantasys)
Ultima (In Final Fantasy Tactics...in Ivalice there are five crystals that has a gaurdian called Totema. When the gaurdian is tooken down and the crystal bites the dust you can summon the Totema. each race can summon a certain Totema and Ultima is the Nu Mou's Totema)
Ive played FF Tactics and its fun .-. for the GBA