>>55156831Won't breed in captivity =/= can't breed
>>55159712Koraidon CAN be ridden, that doesn't mean it was "designed" be ridden any more than a horse was.
The dominant Koraidon we see in Area Zero consistently maintains a bipedal stance, while our Koraidon is repeatedly stated to take its quadrupedal "Ride Form" because it was weakened and submissive after being defeated by the dominant Koraidon. It easily be argued that the bipedal stance is their more natural state, when not carrying a human or traversing difficult terrain (even then, at the beginning of the game your -raidon simply carries you in its arms instead of letting you ride on its back).
Koraidon might resemble a bike when it's being ridden like one, but even then it's still moving on hands and feet. And it looks much less like a motorcycle when it's flying through the air, paddling through the water or scaling a sheer cliff.
The idea that Koraidon inspired motorcycles is obviously ridiculous, as Koraidon was unknown until recently and people could instead take inspiration from its domesticated descendant Cyclizar, which is a much closer resemblance.