>>58101255
Dev doesn't work that way, there's a reason Morimoto got in hot water for inserting Mew in the first place because the game could have legitimately become unplayable if Mew broke the game. And Mew was inserted in the first available MissingNo. slot in the game. What
>>58101281 said applies. They were haphazardly inserting stuff as they went along and just yoinked it out of the code if it went unused because swapping code means you also have to make sure to check for all possible references to that index check for the right index otherwise you end up with the Burn Heal Ball in Gen II
>>58101267
Again, dev notes outright confirm it was never intended to be the case. Just people looking for shit that isn't there because of their own paranoia. There are examples of this though, like Wally was supposed to be the 7th Gym Leader and was replaced by Tate & Liza