Author's Note: It's been a while since I've done one of these, so I may as well write about one of the more nonsensical HMs… Dive is pretty cool, but, man, are the physics brain-breaking.
Dive
Orangen held on to her Swampert tightly as he dove underwater. She'd just gotten the Dive HM and the appropriate badge, so she was eager to try it out.
After a few minutes of swimming around, Orangen and Swampert came across a wild Clamperl. Figuring now was as good a time as any for some extra level-grinding, Orangen sent out her Camerupt. Sure, she was really weak against Water-Types, but she could always switch out if something went wrong.
"Okay, use Flamethrower!"
Camerupt nodded and luckily got a critical hit, increasing the damage for the normally not very effective attack. Clamperl responded with a Whirlpool, unfortunately doing quite a bit of damage. Pausing, Orangen considered whether or not she should switch after all or just use a Hyper Potion, but then something else occurred to her…
"Wait, how did you use Flamethrower underwater?"
Orangen raised an eyebrow at Camerupt. To her credit, Camerupt looked just as confused as her trainer did.
"Also, how am I even talking right now?" Orangen went on. "And how are we breathing?"
Promptly, Orangen and Camerupt started choking on all the water. Swampert panicked and grabbed the two of them, swimming up to the surface as fast as he could.
Meanwhile, Clamperl just sighed and hopped away; all of the trainers he'd seen who hadn't thought about it had gotten through the underwater areas just fine.