This team has one huge problem: Ice (especially walrein and mamoswine). So I am searching for suggestions to improve it. Thanks!
Hippowdon @ Leftovers
Ability: Sand stream
EVs: 252 HP/ 4 Atk/ 252 Def
Impish Nature
-Earthquake
-Slack off
-Whirlwind
-Stealth Rock
Excadrill @ Steelium z
Ability: Sand rush
Evs: 252 Atk/ 252 Spe
Lax Nature
-Earthquake
-Iron Head
-Substitute
-Swords dance
Garchomp @ Garchompite
Ability: Sand Force
EVs: 252 Atk/ 4 SpD/ 252 Spe
Jolly Nature
-Earthquake
-Outrage
-Poison Jab
-Swords dance
Gliscor @ Toxic orb
Ability: Poison Heal
EVs: 252 Atk/ 4 SpD/ 252 Spe
Adamant Nature
-Facade
-Agility
-Baton Pass
-Swords Dance
Donphan @ Assault Vest
Ability: Sand Veil
EVs: 248 HP/ 252 Atk/ 8 SpA
Brave Nature
-Rapid Spin
-Ice Shard
-Earth Power
-Superpower
Krookodile @ Focus Sash
Ability: Moxie
Evs: 252 Atk/ 4 SpD/ 252 Spe
Jolly Nature
-Bulk Up
-Dragon Tail
-Rock Slide
-Pursuit