In Pokémon Legends: Z-A‘s Mega Dimension DLC, you will need to make a Delta Old-Fashioned Donut in order to help Ansha complete her dream of meeting Rayquaza. Just like the alpha donut and the omega donut before this, you’ll need to combine the right berries to make this treat. This is the last donut you’ll need to make to progress in the story, though there is one more optional special donut after this.