Funny, I thought that in PSII and PSIV, the bio-monsters were created from accidents and mutations, or when the bio-plants were malfunctioning. In PSII, the robots were like the police in a sense, since they were sent after Rolf and the gang since they were convicted criminals (and they did get caught in the long run). In PSIV, the machines were found in various places where machines were present, and they probably could've been produced as a measure of security and such.
As for PSI... I don't know much about the origins of anything in there.
Now, in PSIII robots and monsters alike were tools of war, used to fight the enemy. Not much more to it than that, though.
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