>>50772639Serena's goal happened around episode 50. Ash just got his forth badge. Pokemon XY have 93 episodes and XYZ have 43 more. That's way more earlier than when Koharu meet Serena. All she got was encouraging and that's it. Koharu didn't even joined a Pokemon contest yet. You can't compare both girls as the same thing. Koharu surely is the worst and most boring heroine of all times this anime been running.
>many people didn't like that they basically ripped off May and Dawn's goalsPokemon contests and pokemon perfomances aren't the same. Similar but no. If you didn't know, Ash can't get another friend trainer with the same goals as him. That would require the anime lose double the time with the same characters ( challenge the gym twice ) when they have limited resources. And then the classic "who is better" controversy something like that could cause.