152 If you count togepi. She appeared in the old show, so, I think she counts.
Also Pikablue (later renamed Meril) was a super glitch in the old games, if you caught Mew. So 153.

Anyways, I think Duskull was in Ruby and Saphire, right? Ruby and Saphire was pretty damn good, but I'm sure we can all say Red and Blue had it made.