>>52093648Developers boxes. Those are usually objects that run scripts in the game, some developers use a default cube (hence the name) or an object from the game.
They normally are only visible when a game is in development and they make them invisible after a game is shipped.
Some developers boxes out of bounces remain in a lot of games, you can see one behind the waterfall in Lugia's cave in HGSS.
That's why we will probably get another patch the day of release to hide those things.