Id be the best gym type Ice my team would be
weavile:Night Slash,Ice Shard,Brick Break,Aerial Ace
Froslass:Ice Beam,Shadow Ball,Destiny Bond,Thunderbolt
Mamoswine:Ice Beam,Earthquake,Amnesia,AncientPower
Delibird:Ice Beam,Present,Fly,Protect
Jynx:Ice Beam,Lovely Kiss,Psychic,Focus Blast...