@BluebriarArts They explain this in Chapter 3 and 5, the things created in the Dark World don't carry over into the Light World.
Only things that were originally from the Light World, like Pencils and Watches, can be brought back. Things created in the Dark World just don't exist
@MitchPoke I mean it's not like he had a better play?
Sableye is slower than both Basculegons, so Knock Off wasn't an option. Quash or switching Sableye wouldn't have saved Dragonite either