The Matori Matrix is an elite unit of Team Rocket Grunts headed by
Matori and it's second in command
Gozu, first appearing in the Sun and Moon series.
Initially, they were tasked trying to capture Necrozma, but failed. In their next appearance, trying to steal
Stufful from the TRio, they got their ship destroyed by
Bewear, as well as Gozu seemingly leaving the group.
While the group originally had seven grunts not including Gozu, it got downsized to four in Journeys. The
Matori Matrix Grunts' Purugly,
Matori Matrix Grunts' Skuntank, and
Matori Matrix Grunts' Toxicroak are references to
Mars' Purugly,
Jupiter's Skuntank, and
Saturn's Toxicroak respectively.
In an alternate dimension, the Matori Matrix Grunts work under
Meowth.