Sceptile Leaf Blade
Nighttime Guardian
Not being able to get more Type: Null or breed them. If you want to use it you either have to trade for it, which is difficult as it's a one-off per game, or forego the Dex entry for Silvally. You can't ever use your own Type: Null after evolving it because Silvally can't change back.
Meh, so many things are retcons. We're also led to believe that apparently everyone in Kanto hates their Golbats and Eevees because they never discovered Crobat, Espeon, and Umbreon. If they wanted they could have given Espeon a Sun Stone evolution, Umbreon a Moon Stone evolution, Leafeon and Glaceon with the Leaf and Ice stones respectively, and Sylveon with the Shiny Stone, and I don't think many people would have really minded.
You could come up with any number of reasons for why it wasn't mentioned (besides the obvious one that the concept didn't exist), but it doesn't change the fact that in-universe there's a perfectly serviceable reason for why it wasn't seen.
But the point you were making doesn't hold out. Both Eevee and Leaf Stone exist in RBY, and making them interact with each other later when they didn't before is a retcon. With Mega Evolution, they can cop the excuse that it existed, and just wasn't seen or mentioned. They also have the whole alternate universe thing going on in ORAS, suggesting that RBY could take place in a universe where Mega Evolution was never a thing in the first place if you feel like going that route, but they have a consistent excuse either way.
Meh, so many things are retcons. We're also led to believe that apparently everyone in Kanto hates their Golbats and Eevees because they never discovered Crobat, Espeon, and Umbreon. If they wanted they could have given Espeon a Sun Stone evolution, Umbreon a Moon Stone evolution, Leafeon and Glaceon with the Leaf and Ice stones respectively, and Sylveon with the Shiny Stone, and I don't think many people would have really minded.
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