Which Generation I Pokémon has a base stat total of 680?

Mewtwo has a Generation I base stat total of 680.

In the original games, Mewtwo is a powerful Psychic-type Legendary Pokémon found late in the Kanto adventure. Its unusually high combined base stats made it one of the strongest available Pokémon in the first generation.

A base stat total is the sum of a Pokémon's six base values: HP, Attack, Defense, Special Attack, Special Defense, and Speed. It is a comparison tool, not the same thing as a Pokémon's actual in-game stats, which also depend on level and other factors.

Mew is a common source of confusion because it is closely connected to Mewtwo in the story and also belongs to Generation I. Mew's base stat total is 600. Dragonite also has a total of 600, while the Legendary birds have lower totals in their original forms.