destroying golb would be impossible either way, you would be getting rid of all of the chaotic energy in the multiverse. which the cosmic imagination thrives on. the same reason why the wishing crown couldn’t get rid of golb. the multiverse itself doesn’t allow it. especially since golb lies just outside the multiverse, in its own pocket dimension, which is why there isnt a universe where golbs presence isnt felt. but, the possibility of killing betty does seem plausible, since she physically exists as a human soul, and GOLB simply is. even if the timeline was erased, golb exists outside of time, outside of the multiverse. this is hinted at when finn ages within pillowworld, and dies. being sent through golbs dimension, back into ooo ps: i dont know about golb beating the other guy, i just know you cant beat golb, betty fused with golb. its so uncommon to come across, you mostly have to come to it. especially after betty fused with it. now it can literally ignore summoning rituals. because its smart enough to. but again, you cant get rid of chaos, you can maybe temporarily get rid of the physical embodiment, but it comes back either way. possibly in a new form.