Then let us hope they try to make the new pika clone somewhat useful as has been done so with Togedemaru in VGC. Given the ability's description "triggers more aggressive and volatile behaviour ", Morpeko might have an increased attack stat or something like a Hustle effect in its dark form. Otherwise, having an ability only for the sake of a new signature move would be kinda lame.It's actually different. The mechanic is "changes every turn".
That said, being a pikaclone, I wouldn't really expect competitive stats on it, and most likely will just be a fun in-game gimmick / low tier pokemon at best.