>>57550786>championsThe main games have been determinedly shilling each Gen with its own gimmick since Gen 6 and removing them for the playthrough, if not entirely since Gen 7 (where megas were locked to post-game and an event distribution for the mega stones, before USM allowed you to buy multiples). The fact they're not being added to SV for VGC also points to them not being considered for a return to the main series, just like the rest of the gimmicks aren't, save potential Legends games set in their regions (unless Gen 10 is "every gimmick's back!" for the 30th celebration).
But when Champions is up and running, it won't matter, you can take your megas and battle VGC rules vs other people using other gimmicks, keeping the main games free of your cancer.