Here is the translation from dephender.
"As far as Satoshi's battles as a Pokémon Trainer are concerned, Pocket Monsters XY gave me the impression that he had matured a lot. This made it difficult to create new dramatic story arcs for him, but since Satoshi is such a straightforward person, he has this aspect to him where he sometimes forgets things he's already learned from experience. When this happens, we have Go comment on how "THIS is what Satoshi is ACTUALLY like" or "THIS is what Satoshi always says", etc. This makes Satoshi a boy who still has a lot of room to grow. He's someone who always continues to strive towards his goal, and you could even say that if he didn't do this, he wouldn't BE Satoshi. Our job as writers is to find ways to make this happen"
Thanks, I remember Dephender on Serebii had made a translation for this interview, I just couldn't find where it is.
And this is simply amazing, the SERIES COORDINATOR for Pokemon JN believes that a core personality trait of Ash is forgetfulness.
See guys, this is why JN030 and JN036 happened, because Ash FORGOT he promised Pikachu to train with him, and he also FORGOT he invented the strategy for climbing Draco Meteor. But don't worry guys, we have good old Go here to remind Ash about the things he's forgotten!