PokéBase - Pokémon Q&A
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2 Answers

6 votes
 
Best answer

Wailord IS The Longest, But Groudon is The Heaviest

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sorry, i know this was before sun/moon was known, but now cosmoem is the heaviest.(it's kinda like a black hole!)
1 vote

As of Sword and Shield, Eternatus is now the biggest.

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