Not sure about the last two but the first 8 are everywhere.
Not 100% sure. I've never battled a single Scizor or mega Gengar after 70-80 battle spot Wi-Fi battles which is a huge surprise. I do see a lot of Talonflame, Greninja, and Garchomp though.
That's surprising, this is coming from me, who uses Garchomp, Scizor, Gengar(non-mega), and Tyranitar.
But for Gengar, is it the Mega evolution or just Gengar in general?
I have seen a few Gengars in team preview but only battled against one that wasn't mega. I run a mostly physical team with only Volcarona and Rotom-W being special attackers when I do battle spot. So I can see why people might not opt to run with it in a 3v3 scenario.
3DS Friend Code: 1650-1946-7733 - IGN Ryan Normal Safari (Eevee) - SV: 335