It does get a Mega Evolution, though, so don't count the Aron line out quite yet. For fans of the anime, Aron debuts in A Hole Lotta Trouble, where the trainer Steven has one.

Pokemon fans are surprised to discover Aron's mouth after 20 years. A Reddit user shared a screenshot showing Aron's hidden mouth, amusing the Pokemon community.

Pokemon GO has a Hoenn Region event coming up, and we've got the list of Pokemon that'll be out in force. The Shiny Pokemon that'll be in the mix are numerous – but noy all common.