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The major difference is that Kalos Ash performed competently, had a decent team and seemed set up to succeed for a change
BW Ash didn't even deserve to be in the league, he lucked his way through most of the gyms and his final gym battle against Roxie was a 6v3. Even with the advantage of twice as many available pokes Roxie reamed his asshole, he lost a third of his team to a fucking Koffing. He only ended up winning because he got lucky with his last remaining mon Pikachu paralyzing Garbodor.