Is Ash's Greninja likely for his anime set after "The Rainbow and the Pokemon Master!"? Why?

MrCarle

Back in the beginning of his XY anime series, Ash has caught Froakie, the one in wild that got himself disobediently estranged from his unnamed former original trainer, never making his own comeback. In the XY Kalos Quest season, Ash's Froakie evolved into Frogadier, and then later in the XY&Z season, he evolved into Greninja, the one that was once known for his capabaility of his temporary transformation, his Ash-Greninja bond phenomenon, until Ash released him back into the wild at the of this season. He also made his physical comeback to his second former Trainer Ash Ketchum in his Ultimate Journeys anime season from his Journeys anime series, even though Greninja never rejoined his party because his was already too full of his Pikachu, Dragonite, Gengar, Lucario Sirfetch'd and Dracovish. Thorughout his entire To Be a Pokémon Master sub-season by end of his final pre-retirement episode, The Rainbow and the Pokémon Master!, ever since his prior final physical appearance as in his episode, Whittle While You Work!, Ash's formerly Trained Greninja was seen only in his flashback as his trained Frogadier in his episode, The Same Moon, Now and Forever! So, by the way, do you think that Ash's formerly Trained Greninja is phyiscally likely for his anime set after "The Rainbow and the Pokémon Master!"? Why? Please let me know, thanks.😉