Other known variants
x2
-20Stance Change
Once during your turn (before your attack), you may switch this Pokémon with an Aegislash in your hand. (Any cards attached to this Pokémon, damage counters, Special Conditions, turns in play, and any other effects remain on the new Pokémon.)
Buster SwingThis attack's damage isn't affected by Resistance.
If I use Aegislash's "Stance Change" Ability, to switch for another Aegislash, can I then use the new Aegislash's "Stance Change" if I want to?
No, even though you have switched to a new Aegislash card you cannot use Stance Change again because the effect of using it remains on that Pokemon.
When using Aegislash's "Stance Change" Ability, do I have to switch the Doublade & Honedge underneath it too?
No, you only switch one Aegislash card for another Aegislash card.
When using Aegislash's "Stance Change" Ability, what do I do with the card after I switch it with an Aegislash from my hand?
The Aegislash that was in play goes into your hand.