Metagross GX: Consistency: 7/10 | Damage Output: /10 | Versus Meta: 7/10 | Overall: 8/10 | Just very consistent, while dishing out big damage. However, it just doesn't do enough damage nowadays, with Golisopod, Zoroark, and Greninja Break running rampant, and no real way to increase its damage output.
If Gardevoir is 7.5 consistency then metagross should be 7.5 and metagross/solgaleo would be 10/10 damage as you can hit 250 easily
Metagross/Solgaleo in my opinion is too rogue of a deck to consider. Though it's damage output will be drastically increased with Dusk Mane Necrozma, being a Basic that can hit 250.