- Cosmoem, Celesteela
- 999.9 kilogram(s)
- United Kingdom ()
The heaviest Pokémon are Cosmoem and Celesteela, both weighing 999.9 kg (2,204.4 lb), as verified on 26 February 2019.
Cosmoem is a Psychic-type Legendary Pokémon introduced in Generation VII and is the evolved form of Cosmog, one of the lightest Pokemon. Celesteela is a Steel/Flying-type Pokémon also introduced in Generation VII and is one of the two UB-04, the other being Kartana, again another one of the lightest.