Eternatus is listed as the tallest Pokémon species, with a height of 20 metres.
Eternatus is a Poison- and Dragon-type Legendary Pokémon introduced in Pokémon Sword and Shield. It is connected to the Dynamax phenomenon in the Galar region and serves as the central threat during the games’ climax.
Its gigantic height is easy to confuse with its alternate form. Eternatus measures 20 metres in its standard form, while Eternamax Eternatus is depicted as an enormous energy-filled shape during the final battle. The standard Pokédex measurement is the figure used for comparisons of Pokémon species.
Before Eternatus was introduced, Wailord was widely remembered as one of the largest Pokémon at 14.5 metres. Rayquaza and Groudon are also visually enormous, but their listed heights are lower. Eternatus therefore holds the franchise’s tallest standard species measurement.