"Mentality Duo" (Japanese: ???, ???) is a collective term used to refer to the duo of legendary Pokémon Athastros, who represents hope, a positive mental state, and Deliacoros, who represents despair, a negative mental state.

The members of the Mentality Duo are polar opposites of each other; Athastros is Light-type, while Deliacoros is Dark-type. Their base stat totals are identical, however, as are levels at which they learn new moves. The names of both legendary Pokémon end in "os," further implying a connection between the two despite their many differences.


In the gamesEdit

Pokémon Dawn and Dusk VersionsEdit

Pokémon Eclipse VersionEdit

Similar movesetsEdit

Image Name Type Level Move Move Type
200px Athastros Light ??? ??? ???
200px Deliacoros Dark ??? ??? ???

Base stat comparisonEdit

In the animeEdit

Main article: Mentality Duo (M21)

In the mangaEdit


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