A very annoying pair that works awfully well together. These two don't rely that much on what the first one checks that the second can't check, but more with what tools they can provide. Kyogre sets up rain for Ferrothorn, which makes him even more unkillable, taking a disgusting ~30% from a defensive Eternatus' Mystical Fire, or easily living a Sacred Fire from Ho-Oh to Knock Off his boots if necessary. Kyogre loves Ferrothorn's Spikes, whether you're using Specs or Sub CM, because they both love that (minimum) 12% clutch, as Specs Water Spout becomes a 2HKO for Utility Umbrella Blissey, and Sub CM can run Roar to continuously Roar Eternatus out, if he tries to set up with Cosmic Power, or just to PP Stall his Recovers, and because Spikes+Roar is broken.