>>53402630>the game doesn't mention cloning at allFor the record, Dolly the sheep was revealed in early 1997. Yellow/Specil Pikachu Edition released in 1998 an these are the two 'dex entires for Mewtwo in the GB Gen 1 games. That description aptly describes a clone or a genetically altered clone, rather (because that's what we know Mewtwo to be - Mew altered to be the ultimate fighter)..
They don't mention cloning directly, for probably the same reason they pulled a dolly the sheep pokemon. Because it was likely too controversial a topic to blatantly bring up in a kid's game they wanted to sell in america.