In most cases, the controller of the attacking creature will still become the monarch as it is likely their turn.
Youll need to choose carefully after each attack to get the most out of these without granting your opponents too much advantage, but theres explosive potential here when you consider the third ability, and how it applies to all standard damage that turn, since Rankle and Torbran have first strike
Mew ex has two moves the humble 20-damage Psyshot which costs one Psychic-type energy, but another, far more threatening attack called Genome Hacking, which costs three of any type of energy, and allows you to choose any of the attacks from your opponent's active Pokemon to use yourself, seemingly with no consequences
If an opposing Active Pokmon has energy attached to it and is ready to attack, a Repel gets rid of it, and the opponent may not have another Pokmon with energy attached yet