I'm not against GameFreak using slideshows. They just didn't put any effort into this at all. No sound and 3 static images. Rose's motive is legit retarded.
Now take a look at this cutscene from Pokemon XY.
https://www.youtube.com/watch?v=IUu57VopWv8Still a slideshow, but they put effort into it. It had sad emotional music. It had panning and zooming. It had special fx like particle effects and shadow filters. It had more than 3 images and told an engaging backstory.