Stopping at 1300s as well on Duke of Box.
CCAT Suggestion:
Manaphy w/ Leftovers
Ability: Hydration
EVs: 252 HP / 240 Def / 16 Spe
Bold Nature
- Calm Mind
- Scald
- Rain Dance
- Rest
OK so why Calm Mind over Tail Glow?
The +1 SpDef coupled with physdef investment allows Manaphy to beat these Pokemon after 1 Calm Mind:
252 SpA Life Orb Latios Draco Meteor vs. +1 252 HP / 0 SpD Manaphy: 185-218 (45.7 - 53.9%) -- 2.7% chance to 2HKO after Leftovers recovery
252 SpA Life Orb Latios Psyshock vs. 252 HP / 240+ Def Manaphy: 125-148 (30.9 - 36.6%) -- guaranteed 4HKO after Leftovers recovery
252 SpA Mega Charizard Y Solar Beam vs. +1 252 HP / 0 SpD Manaphy: 204-240 (50.4 - 59.4%) -- 78.5% chance to 2HKO after Leftovers recovery
Rain Dance prevents a second before you can recover, forces the switch
252 SpA Pixilate Mega Gardevoir Hyper Voice vs. +1 252 HP / 0 SpD Manaphy: 153-181 (37.8 - 44.8%) -- guaranteed 3HKO after Leftovers recovery
252 SpA Life Orb Gengar Sludge Wave vs. +1 252 HP / 0 SpD Manaphy: 134-160 (33.1 - 39.6%) -- 15.1% chance to 3HKO after Leftovers recovery
252 SpA Choice Specs Keldeo Secret Sword vs. 252 HP / 240+ Def Manaphy: 151-178 (37.3 - 44%) -- 100% chance to 3HKO after Leftovers recovery
252 SpA Raikou Thunderbolt vs. +1 252 HP / 0 SpD Manaphy: 182-216 (45 - 53.4%) -- 0.4% chance to 2HKO after Leftovers recovery
Meh
0 SpA Rotom-W Volt Switch vs. +1 252 HP / 0 SpD Manaphy: 104-126 (25.7 - 31.1%) -- 4.6% chance to 4HKO after Leftovers recovery
252 SpA Life Orb Starmie Thunderbolt vs. +1 252 HP / 0 SpD Manaphy: 143-169 (35.3 - 41.8%) -- 79.5% chance to 3HKO after Leftovers recovery
180 SpA Life Orb Tornadus-T Hurricane vs. +1 252 HP / 0 SpD Manaphy: 133-156 (32.9 - 38.6%) -- 2.7% chance to 3HKO after Leftovers recovery
68 SpA Zapdos Thunderbolt vs. +1 252 HP / 0 SpD Manaphy: 168-198 (41.5 - 49%) -- guaranteed 3HKO after Leftovers recovery
You get the point. Manaphy has the opportunity to switch in and set up on a lot of mons such as Hippowdon, Lando-T (physdef), Tyranitar, Scizor, Heatran, etc. Once it gets up a Calm Mind it can only be stalled or beaten by Serperior, Electric Types, Volcanion, Unaware Clef, Chansey hax, and it will die if you play it poorly. Fortunately, teams have more than one Pokemon. Scald in the Rain with a chance to burn becomes frustrating, especially because Calm Mind also grants a SpAtt boost. Rain Dance is also frustrating for sand teams, because they won't be able to keep their sand up for long. This set works well with sand against opposing rain teams. 16 Speed outspeeds Adamant Bisharp. Other mons should be able to beat water-resists (Dragon, Grass, Water, Water Absorb) A good option is Ferrothorn because it resists those three types and can live longer under rain with weakened Fire attacks, Tornadus-T can use rain and power through M-Venusaur, Amoonguss, Celebi, and Serperior. If you use sand, Hippo+Drill is good for Electric types such as Manectric.
This loses to Volcanion 1v1
