Selina hearing this seem to put herself in deep thought before she said "Then I would assume it was a trick of a ghost type. Unless he found a way to harness Galar energy where he wanted, which in itself is a scary though, epically since a forced Dynamax pokemon will probably lose its mind and attack whoever was near it. In the Gyms and Den, it is possible to easily control that power, but forcing it outside those areas is asking for a lot of Chaos". 

She though about it a little more before she said "I'll pass on what you told me to Professor Magnolia in Galar, shes made a living by studying the meteors and the Dynamax transformations for a long time. She might be able to shed some light on the subject if you meet her when we go to Galar"