Oh yeah, I remember this, I fell IN LOVE with the HM Dive :3
I had such great times using Dive, hearing that cute Dive song and catching Pokemon in the seaweed on the seafloor ^_^ Sure, you could only catch either a Clamperl or the very rare Basculin, but still I had such a blast going underwater :3
I still wonder though, how my character managed to hold her breath this long xD (*spend hours underwater ROFL)
...HM Dive why you no come back like it was in Gen.3? *sniffle* (not Gen.5 cause you actually had like... 60 seconds to get underwater xD I want to spend HOURS underwater again rofl)