The third generation (generation III) of the Pokémon franchise features 135 fictional species of creatures introduced to the core video game series in the 2002 Game Boy Advance games Pokémon Ruby and Sapphire. These games were accompanied by the television series Pokémon Advanced, which aired from November 21, 2002, until August 28, 2003, in Japan.
The following list details the 135 Pokémon of generation III in order of their National Pokédex number. The first Pokémon, Treecko, is number 252 and the last, Deoxys, is number 386. Alternate forms that result in type changes are included for convenience. Mega Evolutions and regional forms are included on the pages for the generation in which they were introduced.