This is just quick giude how to find these two creatures. Scorch drops Hellfire (legendary SMG), while Spycho drops Neogenator (legendary shield which restores health).
Both are spawned every time you play in any mode (I play in normal mode). If Spycho doesn't show at first, is is because he is up on that small cliff on the left. Just take a look around and you'll see him.
So far I didn't yet got Hellfire (after about 20 kills) while I got Neogenator in third kill.
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