You could try Rotom-W > Raikou and a Defog Latios > Starmie and then try some different Mega over Diancie :o
this would give you a decent check to Rotom-W, two Water-type resist, a second check to Talonflame. Rotom-W can also cripple Venusaur with burns or Volt on an incoming Lati@s to let Scizor trap them, so you will have plenty of options IMO.
GET.
GOLD NOVA.
THEN.
DMG.
MUUUUUUSSST.
lol I actually don't care that much, I've accepted that I'm bad at that game and that I must improve. I ain't going to solo queue at all though.