it's only available online. on offline GC/XBOX the Parasitic Gene: Flow, which is needed to make Dark Flow, doesn't drop as they forgot to program the drop rate (or so i heard). the coding for item to drop is there and servers can activate it but Sega didn't put in a drop rate offline so it stayed a 0/1. it was the same with Falz and the Red Ring. on most server it has something like a 80/1 drop rate.
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