As the fellas from RU and NU can confirm, Harvest Exeggutor makes good use of Lum Berry just fine even without perma-sun, so Trevenant is looking really good right now. Decent stats, good movepool, and an awesome typing will make it at least OU viable, if not OU material.Well with nerfed weather I don't think it sounds really appealing (for 100% chance you need sun up). And relying on 50% chance to get your berry back after consuming sounds really shaky. Not a fan of this ability myself honestly.
Also, defensive Aegislash can counter Mega Lucario at least once:
- 252+ Atk Mega Lucario Crunch vs. 252 HP / 252+ Def Aegislash: 112-134 (34.56 - 41.35%) -- 70.36% chance to 3HKO
...while Aegislash can answer back with either Sacred Sword or WoW (assuming it gets it, but all Ghost-types except from Golurk get it iirc).
You can't use non attacking moves with Assault Vest.I'm thinking that assault vest might be a decent choice on Aegislash because it will make him even more difficult to take down from the special side and you have king's shield for the physical attacks.
Also Aegislash is also going to suffer from a severe case of 4MSS because you want king's shield, his two boosting moves and Iron head, shadow sneak and sacred sword for coverage.