>>49193299yesterday I watched a video that said Chimecho's the Rayquaza to Duskull's Groudon and Shuppet's Kyogre. Their shinies and version specificity even match (Duskull's ruby, Shuppet's sapphire, Chimecho's kinda green).
The thing that makes me disagree of this is that Chimecho seems to have been planned for Sinnoh (it's the last pokémon programmed to Ruby and Sapphire), replacing Shellos and Gastrodon who were supposed to be Hoenn pokémon (I think this was from an interview?)