What happens if a Poison-type used Leftovers?

Question

I have a Roselia with Leftovers (in the middle of a Gym battle, so no take backsies!) and I was wondering. Since Black Sludge hurts all other types, and since I’ve seen no Poison-types with Leftovers on Showdown random battles, what would happen if a Poison-type used Leftovers?

Answer 1

Absolutely nothing different.
Leftovers would work on them just as well as on any other Pokemon. Black Sludge is a special type of Leftovers for Poison-types, but Leftovers are fine just the same.

Source: Experience and this replay

Answer 2

Leftovers functions the same way for every type.

Source