>>34183704>skipping Poni IslandThat's not happening.
Skull still needs to properly debut, so when that happens we'll have Nanu, Po Town, Tapu Fini, and most importantly
I'a will return for when Ashimari evolves into Brionne/Primarina. There's tons of stuff left for the anime to go on.
Given how the staff don't know when the next set of games are coming out they may be leaving some things for later on if they need to pad out the series instead of giving us 1 whole year of filler like Johto or DP. Despite the fact that Nintendo is probably pushing for a late 2018 or early 2019 Pokemon Switch release OLM is probably spacing things out as much as they can while having a game plan in head for when they get the notification that the Switch games are going to release.