Rider
It was clear from the confused look on Oka's face that she simply did not understand what was so odd about beating up and kidnapping intelligent creatures. Yet, whilst Rider was clearly somewhat uncomfortable with the idea, she also couldn't deny that Oka's Pokemon at least obviously did not have any objections to their treatment. The way Sylveon was purring happily in her arms, the loyal and loving attitude Wormy had towards her and, even, the seemingly-friendly teasing from the Pokemon that had appeared from the ball made that clear. She obviously cared deeply for the creatures and, in turn, theu obviously cared for her.
Further, now she thought about it, many people would consider her own situation to be rather questionable. After all, she was summoned to fight other Heroic Spirits in a battle to the death. And, even despite being the official "winner", she knew now that the Grail's corruption would have made the wish that served as the bait for servants go catastrophically wrong in any case. Further, Sakura had summoned her with the intention of handing her over to her abusive brother, knowing it would weaken her and seriously reduce her chances of winning. Yet, despite her origins, she still dearly loved her master and would protect her no matter what, just like these creatures did for Oka. She couldn't truly condemn Oka's actions when her own master's intentions for summoning her were far from flawless.
"I can see that you clearly do look after your Pokemon well and that they are happy with you", Rider said with a kind smile. "But, is that true of all Pokemon owners? It seems like Pokemon are intelligent creatures, do they not mind being captured and imprisoned by a human they don't know?"
Rider sighed for a moment, before returning to her kind smile.
"I can't blame you for it, it seems like it's just how things work in your world, and you seem to treat your Pokemon kindly", she said, softly, making it clear that she wasn't being judgemental. "But, the way your world works does seem unusual to me, and probably to most others here. I really don't understand why intelligent creatures would attack you like that, or why they'd be OK with being captured and imprisoned."