Oppanzer

Oppanzer is a Dark-type Pokémon introduced in Generation Neo-I.

It evolves from Imposert starting at level 33.

Biology
Oppanzer is a large, oppossum-like Pokémon that crawls on all fours. On its back, four Imposert cling on to its fur; it is implied these are its children or younger siblings. Its black fur turns into white markings on its back from where the Imposert have clung so tightly. Usually found with a snarl on its face, this Pokémon moves slow as it is weighed down by the added bulk of the Imposert.

Oppanzer is a female-only species.

Triva
Oppanzer may be based off of opossum mothers, particularly the Virginia opossum, as well as other rodents such as bush babies and aye-ayes. They may also take inspiration from tanks and armored vehicles, such as the German tank Panzer.

Oppanzer may be a combination of opossum, Panzer, and oppression.