Okay, I am on a journey for the first time to obtain ALL 493 Pokemon in HG/SS. Well, I was looking in Ilex Forest for a Psyduck. I used the SuperRod on the water at the ending of the forest and my Pokemon that was walking with me, an Arbok, had an exclamation mark above his head? I know if it was above my character then it means that there is a Pokemon in the water, its the same with the Pokemon too. Why is this?