Which Pokémon became species number 1,000 in the National Pokédex?

Gholdengo became species number 1,000 in the National Pokédex.

Gholdengo is a Steel/Ghost-type Pokémon introduced in Pokémon Scarlet and Violet. It evolves from Gimmighoul after the player collects 999 Gimmighoul Coins, giving its evolution a direct numerical connection to the milestone.

The National Pokédex number 1,000 was reached during Generation IX. Gholdengo’s design resembles a figure made from gold coins, reflecting Gimmighoul’s coin-based theme and the evolution requirement. Its signature ability, Good as Gold, gives it immunity to status moves used against it by opposing Pokémon.

Gimmighoul is often mistaken for the 1,000th species because it is Gholdengo’s pre-evolution and the Pokémon associated with the coins. However, Gimmighoul is National Pokédex #999, while its evolved form occupies #1000.