Hello stranger reading this :D

 Hi i'm Neski and this is my experience with core challenge for dragon. I main dragon under the name "Sky Might Fall" so the transition into this challenge was rather smooth and I guess it's what gave me a slight advantage.

Zygarde and Latias made up the core for this challenge and I lazily swapped them in for 2 similar members on my main team (Dragonite and Latios respectively). It was relatively easy for the lower spectrum of the ladder and I think I made gold in less than 24hours into the challenge before the cracks finally began to show. Latias could hold its own but it was obvious that Zygarde was not on the same level as Dragonite, and with a 4x weakness to ice without multiscale to compensate, zygarde was becoming a liability. I finally made efforts to make zygarde competitive after hitting a tilt and came up with a number of sets, with one roseli berry set being the pick of the litter.
-------------------------------------------------------------------------------------------------------------------------------
Kyurem-Black @ Assault Vest
Ability: Teravolt
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Stone Edge
- Iron Head
- Ice Beam
- Earth Power

Garchomp @ Rocky Helmet
Ability: Rough Skin
EVs: 252 HP / 252 Atk / 4 Spe
- Stealth Rock
- Earthquake
- Dragon Tail
- Stone Edge

Latias (F) @ Latiasite
Ability: Levitate
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Psyshock
- Energy Ball
- Roost

Latios (M) @ Choice Scarf
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Ice Beam
- Psyshock
- Shadow Ball
- Draco Meteor

Hydreigon @ Focus Sash
Ability: Levitate
EVs: 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Dark Pulse
- Flamethrower
- Earth Power
- Tailwind

Zygarde @ Roseli Berry
Ability: Aura Break
EVs: 252 Atk / 252 Spe
Adamant Nature
- Extreme Speed
- Dragon Dance
- Earthquake
- Rock Slide
---------------------------------------------------------------------------------------------------------------------------   Matchups in my favor: Electric, Grass, poison.
Matchups against: Ice, fairy, bug, ground, dark.

Pokemon to watch out for: Choice banded Mamoswine, Mega Gardevoir, Mega sceptile with a support core of ferrothorn and cradilly, mega metagross, genesect.