Snow
Snow Warning Mega Glalie + Aurora Veil. Slush Rush Beartic and Arctozolt run the field.
The build
Snow (formerly Hail) cuts physical damage 50% under Aurora Veil and powers Slush Rush sweepers to double speed. Mega Glalie is the premier Snow setter in Champions. Frigibax / Arctibax / Baxcalibur is the rising star, riding Snow's 50% Ice resistance.
Signature Pokémon
Glalie 
Baxcalibur 
Weavile 
Froslass Lead options
Glalie + Froslass for double-Mega flexibility (only one can transform). Glalie + Baxcalibur for raw offense.
Win condition
Aurora Veil up turn 1, sweep with Slush Rush boosted Ice attackers.
Hard counters
Fire teams (Sun) melt your weather. Brick Break / Defog removes Veil. Tyranitar Sand overwrites Snow.
Signature moves
Sample team
Plug-and-play 6-Pokémon roster you can import to the team builder. Adjust EVs / nature / move slots based on your specific local meta and tournament reg.
Incineroar 
Whimsicott 
Garchomp