The only current way to encounter the Wolf is through expensive beacon purchases via Nightwave… when it is on rotation. The drop rate of the weapon parts are an abysmal:
Wolf Sledge Blueprint (3.948%)
Wolf Sledge Handle (13.552%)
Wolf Sledge Head (13.552%)
Wolf Sledge Motor (3.948
as a person who enjoys farming every item in game this is by far the worst to acquire next to the Plague Star components.
The Wolf would make for a fun boss battle and I could see it being a real challenge if it were a Sortie!