I'm not sure if this is the right place to ask, but I'll try here. In the second fight with Crawli's dad (Rorin, I think), I've seen some people mention that he has a shadow Vivillon that we can capture. However, when I faced him the second time (in the Jungle), he still had the shadow Sudowoodo from the first encounter (used the exact same team of 3 Ludiocolos, just leveled up). At first, I thought I misunderstood when you battled him (maybe in V9 postgame), but that doesn't seem to be the case.
I thought maybe it changed because of the different difficulties (like some of the gym leader's teams, apparently), but that doesn't seem to be the case. I'm not sure if I should report this as a bug or something else.