Fantastic! Thank you!
One final one; Trevenant, what should I build him with?
Thanks!
Trevenant was viable in early X/Y, but the prevalence of Knock Off, Bisharp and Aegislash, as well as its lower overall bulk than Gourgeist, made it lose viability. But if you insist:
-Horn Leech/Wood Hammer
-Earthquake/Rock Slide
-Will-o-Wisp
-Rest
Nature: Impish
EVs: 252 HP/180 Def/76 Spe
Item: Leftovers/Lum Berry
Ability: Natural Cure/Harvest
or
-Horn Leech
-Shadow Claw/Leech Seed
-Will-o-Wisp
-Protect
Nature: Careful
EVs: 248 HP/16 Def/244 SDef
Item: Sitrus Berry
Ability: Harvest
or
-Substitute
-Leech Seed
-Will-o-Wisp
-Phantom Force
Nature: Impish
EVs: 252 HP/180 Def/76 Spe
Item: Sitrus Berry
Ability: Harvest