To get stronger summons,you need to have a lot of gems(garnet,topaz,sapphire,ect.)you can buy them in the town daguerreo,the island near the chocobo's lagoon on the coast of the forgoten continent. If you buy at least 60-70 gems of the same type,the summon corrosponding to that particular gem will also get stronger.ex. 70 opal=9,999 damage from shiva if dagger is around level 50-60.you MUST have the boost ability(learned from "pumice piece")in order for this trick to work.the boost ability raises the attack power of the summons.if you dont have the
pumice piece,them you have a 10% chance of getting the full scene when you summon.this cheat works for eiko,too.but you cant buy phoenix pinions...