Rider
"Uh, why would they?" Oka responded, obviously confused about Rider's question.
Rider opened her mouth to respond but, before she could say anything, Oka continued her explanation. Rider couldn't help but look slightly shocked at the description Oka was giving of how she went around beating up apparently-intelligent animals, kidnapping them and imprisoning them in little plastic balls. Yet, despite her misgivings about how the creatures were captured, Rider could tell that Oka genuinely loved her Pokemon, and treated them kindly. Further, she could tell that they loved her in return. So, whilst she was somewhat uncomrfortable with the situation, she was quite happy to give Oka the benefit of the doubt. After all, she knew that many of the things that were considered culturally-acceptable in her time would be frowed upon hugely in the modern era, and she had no reason to assume it wasn't the same for Oka. Plus, she seemed to be an alternate version of Sakura, so she surely had to be a good person at heart.
Yet, even if she was willing to give the girl the benefit of the doubt, she was still rather confused about how Pokemon were handled. They seemed happy with their situation, yet their treatment seemed almost cruel, from what Oka had said. So, in response to Oka's question, she returned to the earlier question that she had been unable to answer.
"To answer your earlier question, would you enjoy living in a tiny plastic ball?" Rider asked softly, taking great care not to sound like she was lecturing the poor girl. "It seems very uncomfortable to me. The way you obtain them seems unusual, too, do the Pokemon not mind being beaten-up and captured?"