Umbrate

Umbrate is the substance that comprises the bodies of most if not all Ghost types, and is also what a Reaper Cloth is made out of. It can also be coated on weaponry, allowing the weapons to be able to strike Ghost type Pokémon. Within the PMD-B timeline Tagg was able to created ionized umbrate by using the Adamant Orb to look into other timelines and copy their technology, which he incorporated into his Vault.