>>49179325Painera
It shares a naming scheme similar to my cover legendaries.
Elemental + Scientific Name
Pa (Protactinium) + Pan (Panorpida, the super family of flies) + -ain (corruption of reign) + era (Diptera, scientific name for Fly)
Its name is also a reference to its Pokedex entry that states it was once the chaotic ruler of the planet in prehistoric times before Arceus came in and sealed it away.
Pain-era or "the era of pain"
The lore of it being the ruler of the ancient world is a reference to the terrestrial pre Cambrian period usually referred to as the age of insects.