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>there are people who think Ash-Greninja will become Ash's ace in the future
That is impossible. Once Ash hits a growth spurt, he will be taller than Greninja. It would look pathetic if a champion's ace is a pathetic manlet compared to its trainer. Dia, aka Hokuto no Red, is shown to be a big man with an atheletic build which means that Ash will become a tall, dark, and handsome man. Picture Ash defending his title, and he sends out Ash-Greninja. The challenger would die of laughter because Champion Ash looks more threatening than that deviantart recolor abomination.
But Ash's Charizard.... Holy shit, let me tell you about this mother fucker. He's big. Massive. Very good genes since he's bigger than Alain's Charizard which means he would have won the Kalos league if he could mega evolve (not that he needs it.) His proud stature and demeanor would make you say "Yeah, this is a champion's ace." Most importantly, Ash's Charizard is alpha as fuck and based beyond belief. He is the only good Charizard in the whole franchise. Lastly, he will be a major character in the PM 2019 anime as he appears on both posters with unique art, and he's in the capsule machine with other important pokemon like Ash's Pikachu, the Galar starters, and Eevee.