Pochita erases devils by consuming them, which also erases the concept or fear they embody from existence and memory. When he eats a Devil, that Devil’s name and what it represents effectively vanish from the world, and human/memorial acknowledgment of it fades or disappears. There are also moments in the story where Pochita appears able to regurgitate devils he has eaten, reintroducing their concepts back into reality. The exact mechanics can vary by situation and narrative reveal, but the core idea is that Pochita’s Devil Erasure is tied to devouring a Devil and eliminating the associated concept from existence.
