Where it comes from
The line in the source
カントー地⽅出⾝の少年‧ロイの2⼈の主⼈公が、冒険を通じて⼤事な何かを「⾒つける」物語です。 In English
Story of two protagonists, Liko and Roy, who 'find' something important through adventure (the sheet's only Poké Ball mention is Roy's 'mysterious Monster Ball').