Every pokemon series had a regional villain plot within. The seasons were well over a hundred episodes, and they seemed to try balancing the plot over the seasons.
(Excluding Team Rocket since they were in nearly every episode and is therefore...pointless to talk about)
Team Aqua and Magma
AG: 002, 017, 018, 027, 036, 054, 083, 097, 098
A total of 9 episodes. There was one Aqua/Magma story every 12 episodes approximately.
DP: 036, 060, 069, 096, 097, 110, 111, 136, 150, 151, 152
A total of 11 episodes, and they were also spread out so there's an approximate 12 episode gap between stories. However, they have more two-parters and a three-parter dedicated to them. Thus, there's around 20 episodes of non-Galactic stories between each Galactic plots.
Team Plasma, however, has the entire Episode N arc for them. Excluding the Juniper lab filler, Mareep farm filler, and Cheren's episode, they will be appearing in a total of 11 episodes out of this 14-episode arc. I know some episodes don't actually have the bad guys, but N was a previous Team Plasma member in the anime anyways,so his appearance alone might as well count as a Plasma episode.
In short, the episodes were packed together.
So which do you like? Villain plots spread out over the season? Or a separate arc with their episodes packed together?
Personally, I prefer a separate packed arc. There's less waiting between episodes, and they seem more intense and focused on the plot.