Ok so, I feel like I need some guidance. Is there anything I should change/replace? Do you have suggestions for other movesets/items or pokemon? Just let me know.

Vaporeon @Leftovers
Bold 252 HP/252 Def/4 Sp.Def
Water Absorb
Scald
Protect
Toxic
Wish

Medicham @Medichamite
Jolly 252 Sp/252 Atk/4 Hp
Pure Power
Substitute
Zen Headbut
Fire Punch
High Jump Kick

Cloyster @Icicle Plate
Adamant 252 Sp/252 Atk/4 Def
Skill Link
Shell Smash
Toxic Spikes
Rock Blast
Icicle Spear

Ninetales @Focus Sash
Timid 252 Sp.Atk/252 Sp/4 Def
Drought
Heat Wave
Hypnosis
Energy Ball
Nasty Plot

Klefki @Light Clay
Bold 240 Hp/160 Sp.Def/108 Def
Prankster
Light Screen
Reflect
Thunder Wave
Foul Play

Noivern @No item at the moment
Timid 252 Sp.Atk/252 Sp/4 Sp.Def
Infiltrator
Draco Meteor
Focus Blast
Flamethrower
Roost