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I had no idea who this bitch was. Thank god her name in both English and Nipponese is Matori, because that made it easier to find out anything about her. I figured they just gave Giovanni a side-henchman for SM, but apparently she's been around since DP. Her main speaking role seems to have been in BW, but fuck me if I remembered anything about her (or Giovanni for that matter) in XY. I guess she's meant to thematically replace Cassidy and Botch after they disappeared following their one or two episodes in DP.
Side tangent: I'm not a huge fan of the "use all of our moves at the same time and combine them into a giant energy blast" DBZ-esque shit that the anime's been pulling off since XY. Sometimes it makes sense to do, like if two Pokemon are using the same type of move at the same time. Most of the time, though, at least in AG and DP, doing shit like that was a good way for a team in a Double Battle to have their moves cancelled out, unless they had a particular skill for it (i.e., May and Tucker doing the water/fire thing in a particular combination). It felt superfluous when all of the Kalos Gym Leaders, Ash, Alain, Serena, Clemont, and Blaziken Mask combined their powers to beat up the giant rock and kill off Lysandre. In SM, it feels extremely underpowered comparatively since five ride Pokemon can't do shit to Necrozma's base form.