Ninetales-Alola @ Leftovers  
Ability: Snow Warning  
Tera Type: Ice  
EVs: 216 HP / 92 Def / 200 Spe  
Timid Nature  
IVs: 0 Atk  
- Freeze-Dry  
- Disable  
- Encore  
- Protect  

Heatran @ Air Balloon  
Ability: Flash Fire  
Tera Type: Fire  
EVs: 144 HP / 252 SpA / 4 SpD / 108 Spe  
Modest Nature  
- Overheat  
- Earth Power  
- Flame Charge  
- Metal Sound

Regidrago @ Assault Vest  
Ability: Dragon's Maw  
Tera Type: Dragon  
EVs: 24 Atk / 120 Def / 216 SpD / 148 Spe  
Adamant Nature  
- Outrage  
- Scale Shot  
- Breaking Swipe  
- Earthquake  

Ninetales outspeeds Garchomp and rest in Defense, freeze-dry for prim.  Heatran outspeeds Iron Crown after Flame Charge, max Spatk, rest in HP (with 4 spdef like just in case download P2 ig though they don't really run any moves to hit Heatran but like ig it doesn't hurt).  Regidrago tanks Specs PZ and CB Urshifu, speed for base 110s after Scale, rest in attack