Thundurus-Therian @ Choice Scarf  
Ability: Volt Absorb  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Thunderbolt  
- Focus Blast  
- Hidden Power [Ice]  
- Sludge Wave  

Skarmory @ Rockium Z  
Ability: Sturdy  
EVs: 84 HP / 252 Atk / 172 Spe  
Adamant Nature  
- Counter  
- Swords Dance  
- Rock Tomb  
- Rock Slide

Salamence @ Choice Specs  
Ability: Intimidate  
EVs: 252 HP / 252 SpA / 4 SpD  
Modest Nature  
IVs: 0 Atk  
- Draco Meteor  
- Hidden Power [Ice]  
- Flamethrower 
- Hydro Pump  

What They Beat?

Thundurus-Therian 
    Beats Celesteela
    Beats Gliscor
    Beats Skarmory
    Beats Altaria
It has a good typing which beats most of the meta 

Skarmory
    Beats Archeops
    Beats Thundurus/Thundurus-T
    Beats Zapdos
    Beats Aerodactyl

Salamence
      Beats Landorus Both Forms
      Beats Celesteela
      Beats Gliscor
      Beats Skarmory
      Beats Thundurus