I've heard things here and there about the scheduling mess that was the BW2 chapter of Adventures. Can I get the lowdown on what exactly happened there for it to only wrap up 7 years after the game its based on released
Pokéspe used to be run in 3 magazines at the same time. For example the RS, Emerald and FRLG arcs were running at those 3 magazines at the same time back in the day
However, around 2012, in the middle of BW2 arc, pokéspe downgraded to two magazines. Soon after, XY came and they lost their second magazine, changing to sunday webry, so Kusaka and Yamamoto had to choose between starting XY and finishing BW2. This is theory, but most belive the pokemon company gave priority to the new arc for the new set of games, and this was the first bw2 hiatus.
They eventually could fit their schedule to continue the BW2 arc, but ORAS launched while XY were in their middle-end, and so they had to give priority to the new games once again. This is the era of them working at BW2, ORAS, SUMO (hasn't released, but was being worked on) and XY at the same time that I mentioned before btw.
XY ended a bit after ORAS. This gave two slots for the SUMO/USUM (considered the same arc) arc, and also to finally continue bw2
The second hiatus happened in the middle of USUM arc, around april 2018. Some say this was the time where Kusaka and Yamamoto were starting the early drafts to the SWSH arc, but no one knows. BW2 picked up back for the last time in april of last year, and was finally finished in april of this year, where we already had 6 volumes of the SWSH arc.
edit: man, now this makes me want to have a thread to discuss about the manga. i love talking about them lol