Hi Xarly, You dont think in Walls. You need minimum 1 special wall and 1 physical wall.
Also you want to use 2 pokemon with dragon dance (and they are ubers). Its important to create different movesets. Use Choise Band (Special, attack, or speed) in 1 or 2 Sweepers.
Metagross doesnt learn Spikes and Bullet Punch in this game.
Quick atack is a physical move so it is not apropiate for jolteon. And you also chose 2 electric attacks, its better to use moves of different types to have coverage.
Finally I recommend you to use 1 pokemon with mixed attacks, like: Flygon, Blaziken, Houndoom, Swampert, Snorlax with Fireblast, Pikachu with Light Ball... c: