Where it comes from
The line in the source
2000年10月に、社名を株式会社ポケモンに変更し、取り組む領域をポケモンのブランドマネジメント全般に拡大しました。 In English
In October 2000 renamed to The Pokémon Company and widened its field to Pokémon brand management overall; the sheet also says it was founded by the original copyright holders Nintendo, Creatures, GAME FREAK.