Did You Know Eternatus is The LARGEST Normal Pokemon in the Series? Probably Not.

https://www.youtube.com/watch?v=atvbvb0fMiY

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GameFreak did not bother to scale the Pokemon properly during battles. That's why you get a midget Wailord and Tyranitar during battles. As a note, this is also the generations where size is the new gimmick. What were they thinking xD? As a note Pokemon Colosseum, Gale of Darkness, Battle Revolution, and Let's Go had proper scaling.