Yeah. I was freaking out originally. But when I remembered the Speed Mechanics with Mega Evolutions, now I can see this thing isn't that bad. It should get a SpAtk base stat of at least 105. Plus with Priority before it Megas, it should be good.
Im personally hoping for at least 130 SpAtk. Even though Dark/Ghost are extremely spammable, they do have redundant coverage. The biggest problem with a SpAtk around 100-110 is that Sableye has a rather poor offensive movepool (no Focus Blast, wtf). His moves are also rather lacking in the high base power department. I also have a curious question: Will Prankster work on the turn it Mega Evolves? Like if I throw out a taunt at a Deoxys-S the turn I MEvo, will it go first or just fail? Im sure some hackmon players could tell me but I'm not sure about this.