[US/UM] I need help with my Team

[MrGalaxyPants]

I need help with Silvally's memory and moveset and I am struggling with some moves and Items for my other pokemon. Also I will take any other advice I get into consderation. The pokemon I have are:

Silvally
Level: 72
Ability: RKS System
Held Item: Undecided
-Stats-
Hp: 259
Attack: 182
Defense: 150
Sp. Atk: 159
Sp. Def: 157
Speed: 201
-Moves-
Multi-Attack
Undecided
Undecided
Undecided

Decidueye
Level: 83
Ability: Overgrow
Held Item: Undecided
-Stats-
Hp: 236
Attack: 238
Defense: 144
Sp. Atk: 201
Sp. Def: 226
Speed: 140
-Moves-
Spirit Shackle - For STAB and cover against Ghost
Leaf Blade - For STAB
U-Turn - Cover against Dark
Smack Down - Cover against Fire, Ice, and Flying

Noivern
Level: 95
Ability: Frisk
Held Item: Wacan Berry - To cover electric types
-Stats-
Hp: 290
Attack: 172
Defense: 194
Sp. Atk: 260
Sp. Def: 171
Speed: 276
-Moves-
Dragon Pulse - For STAB and covering Dragon 
Air Slash - For STAB
Steel Wing - For covering Fairy, Ice, and Rock
Undecided

Absol
Level: 66
Ability: Pressure
Held Item: Undecided
-Stats- 
Hp: 208
Attack: 207
Defense: 91
Sp. Atk: 127
Sp. Def: 109
Speed: 110
-Moves-
Dark Pulse - For STAB
Future Sight - For covering Fighting
Iron Tail - For covering Fairy
Aerial Ace - For covering Fighting and Bug

Lucario
Level: 64
Ability: Steadfast
Held Item: Maybe Lucarionite?
-Stats- 
Hp: 184
Attack: 104
Defense: 184
Sp. Atk: 177
Sp. Def: 108
Speed: 141

Heliolisk
Don't have one yet so no level, ability, or stats
Level:?
Ability:?
Held Item: Big Root or Wide Lens
Parabolic Charge - For STAB and healing
Surf - For covering Ground and Fire
Thunder - For STAB and high damage
Charge - For stat changes and stronger electric moves