>>53009038He means you can actually look them up in the game. I can't remember how you get there, I think it's searching in your boxes? But they're there. You can see those mega exclusive abilities. But like someone else said, other abilities like Shields Down are not there at all. So for whatever reason they chose to leave in abilities you can't access that only belong to Megas, but took out abilities that belong to regular Pokémon that you also cannot access. Maybe it was an oversight, but it's weird that they would just include some and not all. I think that's the point people are getting at.
Also just want to throw out there that apparently PLA had some mega data in there. Obviously they are not getting added to that game, but SV and PLA were worked on at the same time more or less and SV does borrow some things from PLA, like a lot of the new signature moves and the Hisuian forms, so it's not out of the realm of possibility that Megas were on their mind