>>28750776So the way it works is usually like this, since Gen III at least: If there are multiple stories based on the different games going, they chapters are published in spinoff magazines, so like Corocoro 4th Grader, 5 Grader, etc, and then sorta just organized in the volume releases to make sense. A lot of those magazines were cancelled, so there's less avenues for the multiple stories these days. The most recent run of multiple stories was B2W2, first published in a magazine that was cancelled and is now straight to volume, XY, and ORAS, published in a digital version of the magazine.
Since B2W2 is being published straight to volumes, XY won't be released as full volumes until that's finished. Until then, they're released as mini volumes, so like "XY Special Volume 1, 2, etc" so as to not screw up the main line.