Aha, Pokemon Dash was in fact the first ever Pokemon game I got to play! It was so much fun! The hot air balloon and landing parts were unique. The intro was cute, with an Amie-like interaction with Pikachu. Also, it was funny how Pokemon would land when the balloons were popped too early XD
I remember the Lapras rides, terrain speed-ups and stuff! Swamps, Lava, Water, you know.. I thought it was a good way to introduce touch screen gameplay to the Pokemon audience, and was very engaging. It wasn't as good as Mario Kart in my opinion, but still worth I go.