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Two located in the City Ruins near the base of the building Father Servo is on. Seem to only appear post-Forest Kingdom.
I just found them at the start of Forest Kingdom, having gotten Terminal Repairs and gone to fix the center City Ruins one, they spawned in the area. Now if only I had hacking >_> Killing them with 9S is a pain.
I found them just before the desert. However this was on the second play through.
seems weak to bomb