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While I think it would be a miss if Eusine didin't show up in Suicune's capture episode (if that's the case), it could be interesting if we see Eusine chasing after Goh or coming to the Sakuragi Institute when news comes out about Suicune's capture (I'd imagine Prof. Sakuragi would publicize one...
I think they're going for a "power with control" arc for Farfetch'd. Beating Gurdurr the way it did more than proves its strength, but it's got little control and always puts everything into its attacks. If it can measure its swings/strength and wait for the right moment to strike, it can attack...
I think it would be neat if they used Eevee's mimicking habit to have her learn a move from one of Ash's Pokemon or Goh's Pokemon. For example, it could learn Shadow Ball from Gengar or Iron Tail from Pikachu.
Given Goh's goal of wanting to catch all Pokemon, I'd find it hard to believe that Sobble will stay unevolved.
As for an Intelion not belonging to Goh be recurring, it depends on Intelion's trainer. The one belonging to the female spy might stick around depending on what she's working on; if...
Agree on Ash not catching anything new from Sinnoh. I'd either want them to bring back his Sinnoh reserves or do a Lucario-related plot with Riley if they want to give Ash something to do tying into the Sinnoh remakes.
I really dig the idea of Chloe catching Buneary because of the 0 friendship...
They can easily give Goh one of the Sinnoh starters as part of promoting the remakes (if it's a thing) or just let him go on a catching spree in Sinnoh since he hasn't gotten a chance to do it yet.
Budew -> Roserade would be a solid pick for Koharu, though some people may not like it as much...
We see it leak used in its battle with Wikstrom's Aegislash, so I doubt it breaks. Where would you even get a replacement for that?
Wish they did this with Ash or Gou whenever the plot doesn't focus on them that much. It would give the focus characters more time to do their thing.