This is my first competitive team... advice much appreciated!
Mamoswine @ Choice Band
Adamant
Oblivious
EVs: 252 Atk / 252 Speed / 4 Hp
Earthquake
Stone Edge
Ice Fang
Ice Shard
Gengar @ Black Sludge
Naive
Levitate
EVs: 252 Speed / 252 SpAtk / 4 Hp
Shadow Ball
Thunderbolt
Energy Ball
Will-O-Wisp
Milotic @ Leftovers
Bold
Marvel Scale
EVs: 252 SpDef / 128 HP / 128 Def
Surf
Ice Beam
Rest
Sleep Talk
Foretress @ Leftovers
Relaxed
Sturdy
EVs: 252 Def / 252 Hp / 4 Atk
Gyro Ball
Spikes
Protect
Rapid Spin
Jolteon @ Salac Berry/ Pataya Berry
Timid
Volt Absorb
EVs: 252 Spd / 252 Hp / 4 SpAtk
Charge Beam
Subsitute
Baton Pass
HP (ice or grass)
Togekiss @ Leftovers
Calm
Serene Grace
EVs: ????
Air Slash
Pulse Bomb
Flame Thrower
Thunder Wave
Mamoswine @ Choice Band
Adamant
Oblivious
EVs: 252 Atk / 252 Speed / 4 Hp
Earthquake
Stone Edge
Ice Fang
Ice Shard
Gengar @ Black Sludge
Naive
Levitate
EVs: 252 Speed / 252 SpAtk / 4 Hp
Shadow Ball
Thunderbolt
Energy Ball
Will-O-Wisp
Milotic @ Leftovers
Bold
Marvel Scale
EVs: 252 SpDef / 128 HP / 128 Def
Surf
Ice Beam
Rest
Sleep Talk
Foretress @ Leftovers
Relaxed
Sturdy
EVs: 252 Def / 252 Hp / 4 Atk
Gyro Ball
Spikes
Protect
Rapid Spin
Jolteon @ Salac Berry/ Pataya Berry
Timid
Volt Absorb
EVs: 252 Spd / 252 Hp / 4 SpAtk
Charge Beam
Subsitute
Baton Pass
HP (ice or grass)
Togekiss @ Leftovers
Calm
Serene Grace
EVs: ????
Air Slash
Pulse Bomb
Flame Thrower
Thunder Wave