What was the Japanese title of the first Pokémon TCG set?

The Japanese title of the first Pokémon TCG set was 1st Starter & Expansion Pack.

The set debuted in Japan on October 20, 1996, several months after the original Game Boy games launched. It served as the foundational release for the Pokémon Trading Card Game and included cards based on the original generation of Pokémon.

English-language collectors usually call the corresponding release Base Set. That name is correct for the American release, which arrived on January 9, 1999, but it was not the Japanese title of the original set. This regional naming difference is one of the most common sources of confusion in Pokémon card history.

The Japanese first set contained cards representing the original 150 species featured in the franchise at the time, while the wider Pokédex eventually included Mew as number 151.