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Ash is such a fucking bonehead.
>Only thinks about visiting Greninja because he saw Goh's Froakie evolved and got the idea to train Lucario
>Doesn't even consider training with his old Pokemon until he started wondering how else to train his PM mons and Professor Oak gives him a call inviting him back to the lab
Then again, this is so on-brand for him, since he thinks of things only on the spot even in battle.