Shiranui went with Ashika when he faced the Hydreigon his opponent sent out.  In spite of its type disadvantage, Hydreigon was holding its own through its Hyper Voice, but was no match for the Primarina's Twinkle Tackle.  Once the dust settled from Ashika's Z-Move, the Primarina was singing a victorious tune atop the fallen Hydreigon.