Rayquaza

Great League: - / 5

Rayquaza's CP is too high for the Great League.

Ultra League: 2 / 5

Rayquaza's huge attack stat doesn't do it any favors in any restricted-CP format, but that same huge attack stat combined with a great moveset that has a narrow set of Pokemon able to resist it allows Rayquaza to strong-arm its way into the tier. Here it acts as a cleaner, dropping huge damage from Outrage and hoping for a boost from Ancient Power to patch up its low defenses and make its attack even more obscene. However, it's also very much a glass-cannon, meaning it won't be on the field for very long.

Master League: 3 / 5

At this point, Rayquaza's huge attack is finally an asset rather than a hindrance. Here, it can use its raw power and fantastic moveset to come in and break down whatever stands before it. Rayquaza needs a bit of support in the way of team-mates to cover its weaknesses, the ability to switch out when it hits the field, and/or a shield or two to get the job done, but it can be worth the investment.