If I have a Tera Pokemon on my Bench when I use Landorus' "Earthquake" attack, do they take 10 damage or not?
No, the Tera Trait protects them from damage by your own attacks as well.
Earthquake






×2
-30
EarthquakeThis attack also does 30 damage to each of your Benched Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)




Heavy ImpactIt is thought its body transformed as a result of iron accumulating internally from swallowing soil.
If I have a Tera Pokemon on my Bench when I use Landorus' "Earthquake" attack, do they take 10 damage or not?
No, the Tera Trait protects them from damage by your own attacks as well.