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>facing the league without your strongest pokemon
why would ash do this kind of shit? Charizard is literally the strongest Ash's pokemon ever. He's the only one that has fought and won against a legendary. In an anime episode, no less. It is true that Charizard is overrated, but he's proven himself as maybe even stronger than Pikachu, the ultimate user of plot armor.
Kalos league not featuring Charizard is a mistake.