Delta Aggron (Pokémon)

Delta Aggron is a dual-type Ice/Steel Delta Pokémon.

It is not known to evolve into or from any other Pokémon. As it is a different species from Aggron, it is also completely incapable of Mega Evolving.

Pokédex Entry
Delta Species are Pokemon [sic] that have a different type than usual.

Mount Nova
Delta Aggron can be accessed from the very top of Mount Nova (in the ice area) assuming that the player uses Tesseract. It is at level 60 when encountered.