The only great impact Grookey will have on the show is making all the fans mad because Go took another starter from Ash
I think there will be a more interesting twist when it turns out at the end that Grookey's coach was actually Gou from the start. That would explain the strange dream and the monkey in his arms a little. Say, he caught her in his sleep and forgot about it.
So ur saying that Go is already the trainer? That wouldn't make sense tho as they go to look for grookey's trainer.
It would be interesting if this episode took place Galar and it would be more realistic to happen but for him to catch a wild Grookey in Kanto is what makes it less likely to happen.I like that idea, like it appears to him in what seems like a dream and he captures it, but later it turns out it wasn't a dream at all. It's doubtful that it'd happen this way, but it would be far more interesting than another abandonment plot..
That's the point, since he wouldn't know who the trainer was, due to the fact he woke up with no recollection of the capture despite it happening in his sleep. Therefore he would go looking for the Grookeys trainer, before finally realising it was actually him all along..