What is Deoxys’s National Pokédex number?

Deoxys’s National Pokédex number is 386.

Deoxys is a Mythical Pokémon introduced in the third generation of the series. It first appeared in Pokémon Ruby and Sapphire, the Game Boy Advance games set in the Hoenn region. In the generation’s National Pokédex sequence, Deoxys is the final entry.

The third generation runs from Treecko at number 252 through Deoxys at number 386. This means Deoxys is not the 135th entry overall, even though Generation III added 135 new Pokémon. It is the 135th new species of that generation, placed at National Pokédex number 386.

Deoxys is known for having multiple Formes: Normal, Attack, Defense, and Speed. Those Formes alter its appearance and statistical emphasis, but they do not create separate National Pokédex species numbers. The number 386 therefore identifies Deoxys itself, not one of its individual Formes.