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Odd Egg event done, with 7 randomly generated eggs! Still not sure about adding cross-Gen babies, but I'm happy with this. It actually makes the Lyra cutscene here somewhat useful rather than just filler. Also, there's no shiny chance. It's not possible without custom commands which I have no idea how to do.
Now, to add the GS Ball back in and make the Celebi event accessible. I was thinking of having a Kimono Girl give it to you somewhere in the post-game. Then you'd take it to Kurt, who would investigate Ilex Forest with you, and there you'd be able to catch Celebi. After catching it, you'd activate the Giovanni cutscene. I like this idea, because it implies the Kimono Girls are the ones who enabled you to stop Giovannia from returning.