My team is challenging to use and I got my a__ beat a few times but what is important is how I use mons to setup a stronger:
Delta Venasaur (Calm Mind setup)
Calm Mind, Draining Kiss, Leech Seed, Psychic with Big Root
Delta Muk (tanky boii to take hits and lower speed)
Explosion, Earthquake, Drain Punch, Rock Tomb with Rocky Helmet
Delta Haxorus (heavy hitter & Super Fang)
Super Fang, Aqua Tail, Iron Head, Crunch with Leftovers
Delta Pidgeot (mega for double intimidate)
Sucker Punch, Dark Pulse, DrakkonVoice, Flamethrower with Delta*ite
Raichu (Fake out & Nuzzle)
Fake Out, Nuzzle, Electroball, Thunderbolt with Focus Sash
Gengar (fast spec attacker & Destiny Bond)
Destiny Bond, Dark Pulse, Shadow Ball, SludgeBomb with ChoiceScarf
So the idea was to weed out the dangerous mons and then use Raichu to paralyze it, or Gengar to suicide Destiny Bond. Meanwhile I could allow the other mons to lower stats like speed or attack so Venasaur could heal itself while using Calm Mind as much as possible.
I used hella revives and had to strategically decide who I was going to allow to die in order to beat the Elite 4. Working on a new team recently will let you know when I finish.