Heliolisk @ Normalium Z  
Ability: Dry Skin  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Hyper Beam  
- Magnet Rise  
- Charge Beam  
- Focus Blast  

Ampharos-Mega @ Ampharosite  
Ability: Mold Breaker  
EVs: 60 HP / 252 Def / 84 SpA / 112 SpD  
Bold Nature  
IVs: 0 Atk  
- Hidden Power [Ground]  
- Eerie Impulse  
- Cotton Guard  
- Rest  

Charjabug @ Eviolite  
Ability: Battery  
EVs: 252 HP / 252 Def / 4 SpD  
Impish Nature  
- Iron Defense  
- Confide  
- Rest  
- X-Scissor  

Heliolisk
     Beats Rotom Forms
     Beats Stunfisk 
     Beats Magnezone
     Beats Thundurus-Therian
     Beats Vikavolt
     Beats Ampharos-Mega 
     
Ampharos-Mega
     Beats Golem-Alola
     Beats Eelektross
     Beats Regular Rotom
     Beats Manectric-Mega 

Charjabug
     Beats Zeraora
     Beats Ampharos-Mega
     Beats Electivire
     Beats Luxray     
     Beats Raikou
     Beats Xurkitree

Potential 3-0s:
     Heliolisk 2.5-0.5s