I saw this episode again yesterday, as YTV reaired it at Pokemon's new timeslot. I heard Morrison say it, but to be honest I had no problem hearing it as "Clark". Morrison's voice can be a bit grating.

One thing I found kinda dumb is one of Ash's group says Ash picked a perfect team (Grovlye and Glailie) against Clark even though he was using fire-type Pokemon, and both of Ash's Pokemon were weak against fire-types (Grovyle being a Grass-type, and Glailie being an Ice-type). Considering right after that another character mentioned the type disadvantage they may have been simply referring to those two being the two strongest Pokemon in Ash's lineup, which I can believe.