Round Three: Steel on Steel
The sunlight is strong.
Starmie's gem glows for a few seconds before subsiding, although this time no colors are changed and the light is drowned out by the intense glare cast off of the water's surface. And then Necturna makes it brighter. In a tremendous flash of light, time seems to slow down as a red aura appears around Starmie, slowly depriving it of energy As Necturna grows stronger. As soon as it is freed from the spiritual embrace, Spike begins to spin in a circle as fast as it can. At some point, the speed even lifts it slightly off of the ground. Once the full attack has been prepared, Spike blasts himself out towards Starmie, skidding over the water with his momentum, and knocks the water-type back even with the neutral hit.
Starmie realizes that it can't take a beating, and would be hard pressed to go on the offense. It therefore plays defensively, glowing brightly as a shield of telepathically held water builds up around it, reflecting the intense glare from above. Necturna is far too tired to do anything at all, and merely watches as Ferrothorn bashes against the shield to seemingly little effect. Both Starmie and Necturna watch as Ferrothorn tries to break it again, spinning around rapidly until he's circling Starmie every second.
Then he slams into the gym leader's Pokemon.
And the shield breaks.
The sunlight is strong (1 round).
Calculations and RNG's
Starmie: Reflect Type Ferrothorn: 5 energy, Steel/Grass six more actions
Necturna: Pain Split Starmie: 24 energy, -25 HP Starmie, +25 HP Necturna
Ferrothorn: Gyro Ball Starmie: [(15+3+1.5+3)*0.66] 15 damage, 6 energy, 2 recoil (1073 no crit)
Starmie: Substitute (25): -25 HP, 24 energy, 25 HP Substitute created
Necturna: Chill: +12 energy
Ferrothorn: Iron Head Starmie: [(8+3+1.5+3)*0.66] 10.33 damage, 5 energy, 2 recoil (4689 no crit)
Starmie: Chill: +12 energy
Necturna: Chill: +12 energy
Ferrothorn: Gyro Ball Starmie: Substitute broken, 6 energy
Team Athenodoros

@Enigma Berry
HP: 35
EN: 27
Otr: Grass/Steel Type 4 actions
Team CMFP

@Life Orb
HP: 76
EN: 37
Otr: ---

@Life Orb
HP: 61
EN: 25
Otr: ---