Saw this on another forum, but they had no game log. Was able to reproduce in test deck function. Ninja boy a frost rotom(Ultra Prism 41/156 unsure if other rotoms have this bug too), with 9 or more tool cards in the discard pile, into another basic pokemon. The basic pokemon gains the benefits of Roto Motor. It also allows gx attacks to be used repeatedly by the new pokemon.
Game Log Output **removed**
Client Version: 18.104.22.16815
Server Version: 22.214.171.12413
Bundles Version: 1683
Archetypes Bundle Version: 8693
Localization Bundle Version: 8717
Current Game ID: e459ade0-38a2-11e8-aea2-22000af8049c