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PSP talk:Jigo Booma
From The re-PSUPedia
Tips for PS Perfect hunters :)
Jigo Boomas spawn in the last room of Hill of Spores, the one u teleport to in the block 4, where the clear boxes appear after you kill enemies. So the best way is to rush through the mission until the last block. I don't know about other ranks, but they spawned in rank A for me. Good luck hunting :]