Why doesn't Worry Seed affect Aegislash?

Dec. 13, 2015

Question says it all

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Stance Change cannot be Traced, copied with Role Play, suppressed with Gastro Acid, or replaced with Simple Beam, Worry Seed, Entrainment, or Skill Swap.

Source:http://bulbapedia.bulbagarden.net/wiki/Stance_Change_(Ability)

Worry Seed doesn’t affect Aegislash because the ability Stance Change cannot be altered. It can’t be affected by Skill Swap, Worry Seed, Entrainment, Simple Beam, etc.

Stance Change cannot be Traced, copied with Role Play, suppressed with Gastro Acid, or replaced with Simple Beam, Worry Seed, Entrainment, Skill Swap, or Mummy. If a Pokémon other than Aegislash obtains Stance Change with Imposter or Transform, the Pokémon will not change Formes. ~Bulbapedia