If Aegislash uses its "Hard Bashing" attack against an Espathra with "Stance" that evolved last turn, will I damage it or not?
Yes. Hard Bashing gets through all effects, including Stance.



×2
-30Stance
When you play this Pokémon from your hand to evolve 1 of your Pokémon during your turn, you may prevent all damage from and effects of attacks from your opponent's Pokémon done to this Pokémon until the end of your opponent's next turn.

Glittering EyesIf Tulip is in your discard pile, this attack does 70 more damage.
It emits psychic power from the gaps between its multicolored frills and sprints at speeds greater than 120 mph.
If Aegislash uses its "Hard Bashing" attack against an Espathra with "Stance" that evolved last turn, will I damage it or not?
Yes. Hard Bashing gets through all effects, including Stance.
If my opponent attacked with Magby's "Scorching Heater" attack last turn and I evolve into Espathra with "Stance" Ability this turn, will my Espathra receive the 6 damage counters from "Scorching Heater" if it attacks and does damage to Magby?
No, it will not receive the 6 damage counters. Stance prevents all effects of your opponent's attacks, and Scorching Heater's damage counters are an effect of your opponent's attack.
If my Espathra with the activated "Stance" Ability protection is moved to or from my Bench during my opponent's turn by a switching action such as Boss's Orders is it no longer protected?
It is still protected. It is an effect from an Ability, not from an attack, and so is not removed by moving to or from the bench.
If my Active Pokemon evolves into Lucario and uses its "Stance" Ability, does its effect get cleared if it moves to the Bench?
No, its effect remains.