Creator Breakdown: A literal example; the reason Mato was replaced by Satoshi Yamamoto as the artist was because Mato fell under an illness that left her unable to draw, and Hidenori Kusaka was told he either had to find a new artist, or the series would be cancelled entirely. Mato has since gotten well again, but Yamamoto remains the series artist to this day.
B2W2's second hiatus was likely due to Kusaka getting sick.
Creator-Preferred Adaptation: Satoshi Tajiri, the creator of Pokémon, once stated that the manga most resembles the world that he was trying to convey. It's a long outdated quote though, and may not hold true post Generation II (and Tajiri isn't even in charge of the franchise past then anyway, Junichi Masuda is).
Development Hell: The B2W2 arc fell victim to this when its magazine run ended early to make room for XY and thus was forced to go straight to the volume-only format. It says a lot about how delayed it is when both XY and ORAS (the Gen VI arcs, which came after B2W2) have finished their runs and Gen VII has already started, by the time it finally got another magazine run. Its run was paused again in 2018, which wouldn't be resumed until March of 2019. Kusaka stated that the arc wouldn't be finished until they figured out the ending for the arc, meaning it was due to creative choice. It finally concluded in May of 2020, which is well after Gen VIII had started.
Fandom Nod: Platinum's birthday is October 27th (27/10)...which happens to be the Japanese ship name for Cyrus/Dawn. Um, okay...
Additionally, Black's birthday is October 8th, which is "Touya Day" in Japan. As for White, her birthday is October 5th, aka "Touko Day".
Crystal's mom is Lady Gaga due to her bizarre outfits.
Lady Berlitz has half of the fans calling her Platinum, while the other half calls her Platina.note Purachina is the Japanese loanword for "platinum", so while the game did end up getting named Platinum, those fans cling to Platina because it sounds more feminine, can fit in the seven-digit name input when the game asks you to name your character, and is technically a more literal transliteration of purachina.
I Knew It!: The collective fan reaction to Silver being Giovanni's son, and officially video game canon when HeartGold and SoulSilver came out.
No Export for You: For years, nothing past the Generation I chapters were available in the US. Viz has since picked up the slack by continuing into Gen II and starting new series for Gens IV and V, but left Gen III hanging for a long time until they finally translated it as well.
It's pretty hard to piece together a timeline from the magazine releases alone due to the confusing way they're released. Fans have to wait until the volumes come out to figure out when what happens.
Viz didn't start releasing the Gen III chapters until Gens IV and V had already started. There's also the fact that for a few years they've published multiple arcs concurrently in order to catch up to the Japanese releases, so following that release schedule means you're skipping around quite a bit. This eventually had a Marth Debuted in "Smash Bros." effect, as the big shocking reveal of Sird in Diamond/Pearl/Platinum fell flat since Viz hadn't released the FireRed/LeafGreen or Emerald chapters, so English readers had never seen her before. Carr also showed up in a HeartGold/SoulSilver scene before his original appearance in FRLG.
In the XY arc, Alexa is attempting to reveal about Xerneas and Yveltal's battle while the news is passing it as an unknown force due to Malva's influence as the news reporter. This resembles Ruby and Sapphire, where Gabby wants to reveal about the Devon chairman being attacked by Team Aqua members, but the news media only passes it as a Pokémon attack due to the news director being the leader of Team Aqua. Also, Y's relationship with her mom over her goal takes a big emphasis, similar to how Ruby believed his dad opposed him following his dream as a coordinator.
Again in XY arc, Team Flare discovers and transports Xerneas to their base, only for their enemy to awaken it, and ends up using Yveltal. Which, BW arc had the Gym Leaders discover Dark Stone, where this time Team Plasma is the one to steal it and awaken it.
Schedule Slip: Because of the R/S arc's Ending Fatigue, the manga had a schedule slip for a long time, with Gen IV starting while the Gen III arcs had yet to conclude, Gen V starting while the Gen IV arcs had yet to conclude, and Gen VI starting while the Gen V arcs had yet to conclude. The schedulingfor B2W2 aside, Kusaka finally fixed this problem in Gen VI, as both arcs from that generation concluded just in time for Gen VII to start.
Wally was initially intended to be the holder of third Hoenn Pokédex; in the original magazine run, he registered the Pokédex he accidentally came across. This was changed in the official volume release (where Wally simply picked it up and eventually returned it to Professor Birch), as the writer realized Wally's character wouldn't have fit into the Battle Frontier.
The round known as Escape! was not intended to be included in the volumes (meaning it could have ended up a Missing Episode), but enough fans begged Kusaka to change his mind.
While the story itself would have most likely remained the same, had Mato not fallen under the illness, the art for the later volumes of the Gold & Silver arc and beyond would have looked different. On the flip side, had Kusaka not found Satoshi Yamamoto or chosen not to find a new artist when she did, the series would have been Left Hanging at vol. 9's cliffhanger.
There was some consideration about doing arcs for the Colosseum games that simply did not pan out for whatever reason, most likely due to scheduling issues.
Writing by the Seat of Your Pants: By necessity. Kusaka gets plot, characters and Pokemon from whatever game comes out (with the exception of perhaps Pokemon Yellow), which he then plays, fanboys over, then uses whatever he needs to cook up the story. Goes full circle when later games suddenly have similar plot points to his.
When Pokemon Adventures was first being published, it was actually just called Pocket Monsters, just like that one with the Clefairy. However, Kusaka decided to then change the name before the volume 1's official release, in order to avoid confusion,
This is also how Pokemon Special got its name, where the manga in Tankōbon format would be under the name "Ladybug Comics Special"
The writer for this series, Hidenori Kusaka, acted as an adviser for Miho Asada's Phantom Thief Pokémon 7, also coming up with the name for the main character Hiori.
Hidenori Kusaka and Satoshi Yamamoto worked on short manga for the first two Pokémon Ranger games, said manga only being available online. Kusaka also wrote walk-through manga for the Orre based games, though it was never collected into volume format.
In the HG/SS games, Lyra replaced Crystal. In the manga, Crystal wears◊ Lyra's◊ outfit during the HG/SS arc and Lyra is nowhere to be seen. Meaning, Crys fans got their revenge.