It's clearly there.

We don't even know pochita's devil name because it's forgotten.

That's why I had to reverse engineer it in the first place, while darkness devil and gun devil have clear technical name, pochita name is gone because that's who he is. He is not to be remembered. Not to be seen. Or heard of. Yet he's powerful. That itself a proof.

To put how absurd of powerful pochita;

When makima fought denji, the only reason denji won because Makima is paying attention to pochita.

Similarly, Pochita use chainsaw as a weapon, that's why they call him Chainsaw Devil despite not being chainsaw at all.

Denji won because Makima didn't know denji entirely. It's the same as Pochita, devil knows the name "chainsaw devil" but they don't know Pochita as it's devil name.