When that tail came down, Shadow leaped out of the way, grunting as he landed in a roll. His right hand was already on a Pokeball, but still he wasn't sure what good it would do right now-- He had Mawhile, a steel type... But she was a severely low level.

When Rouge voiced her anger, Shadow looked to her, then stared in surprise (and perhaps some jealousy) at the Water type she sent out. Fitting, that she'd have a jewel Pokemon with her. The water attack was super effective against the Onix, who was now backing up and growling in pain. Looks like it hadn't expected these two travelers to actually have anything strong against its type.