There are a lot of things that the player can easily miss in Crisis Core Final Fantasy VII Reunion and these two summons are among them.
How to Get the Cactuar Summon in Crisis Core Reunion - Images - DMW, Crisis Core Final Fantasy VII: Reunion
10-01: Cactoid Secrets - Crisis Core - Final Fantasy 7 - Reunion Guide - IGN
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How to Unlock all Summons on Crisis Core: Final Fantasy VII Reunion
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Steam Community :: Guide :: FFVII:CRISIS CORE - HOW TO UNLOCK ALL DMW`s GUIDE