It's called MeyerRoux is great for big cubes. MGC cubes are designed to be good at moves. There is the Yau equivalent for Roux as well, learned it but forgot the name.
Creates FB + right down center on top.
M moves are viable for 4x4 and 5x5 only. Even if the MGC for 6x6 and 7x7 have ok M moves, they're usually inconsistent when you're turning really fast afaik. (I've never solved anything higher than a 4x4 lol)