Fem!Lysandre/Fem!Sycamore alternate ending, the ultimate weapon fires
Augustin is beautiful, so beautiful, and Lysandra cannot imagine a world without her but she also cannot begin to imagine a world where everyone continues to suffer like this.
If Augustin will not join her, then so be it. She will burn like the rest of them so that the world may be saved. She cannot let personal attachment interfere with this plan for the greater good.
When the weapon fires, she wonders, briefly, just what she has done.
After it is over, after everything is done and the region is filled with dead people and Pokémon alike, she wraps one of Augustin's labcoats around her shoulders and stares unblinkingly at the wreckage of Lumiose. She does not cry, and she does not scream. She merely stands there, still and silent as a statue, until the last rays of sunlight begin to fade away.
She does not curl up on her bed that night with Augustin's labcoat clutched to her chest, and she definitely does not dream terrible, haunting dreams of dark curls and sparkling grey eyes and an achingly familiar voice trembling with laughter. She does not bolt upright, panting and wild-eyed, cheeks unaccountably wet and mouth tasting of ash.
But most of all, she does not regret.
Not a single thing.