The heaviest Pokémon are Cosmoem and Celesteela , tied at 999.9 kg (2,204.4 lb).

Quick scoop

Some sources also mention Primal Groudon as extremely heavy at 999.7 kg , but the current tied record holders listed by Guinness are Cosmoem and Celesteela.

Tiny note

If you meant the heaviest non-legendary Pokémon, that’s usually Mega Metagross at 942.9 kg (2,078.7 lb).