There are no Sinnoh remakes this gen. If there were, there would be some sort of build up for it, which there obviously isn't. XY advertised Mega Blaziken with the reveal of Mega Evolutions and Gen 3 recievd the 2nd largest amount of Mega Evolutions in XY. Since Gigantamax are confirmed to be Gen 1 and 8 only, that proves that Gamefreak isn't promoting Gen 4 at the moment. Gen 8 will most likely be like Gen 5 which had no remakes.