I really thought Ash will capture in this ep that Mijumaru. It's pretty strange, but maybe later
has the episode finished?
How do you come to that conclusion? He has gotten three pokeballs, just like Jessie. It suggests that he's going to catch three pokemon this region.
BW003 I'm sure.. Preview is airing, Mijumaru is on Ash's shoulder.. Well no surprise about what happens there! xD