Sky Trainers are the kind of flying-type oriented trainers who specialize in Sky Battles. They can only be battled if one has a flying-type or more in their team.
One day, a female Sky Trainer named Yvette is standing on top of a cliff. She's waiting for a certain trainer to pass by so she could battle someone. But she became bored after the waiting didn't do much for her.
"Gee, I've been standing on this cliff for a while now," sighed Yvette. "Isn't there anything interesting to do like fly among the bird Pokémon?"
She stood bored after complaining about a bit until she remembered that she brought a Poké Helium tank along. It was a good thing she brought the item along just in case she wanted to overcome her boredom and kill some time to blow herself up into a balloon.
"Here goes nothing," Yvette said as she inserted the air hose into her mouth and turned on the Poké Helium.
The Poké Helium tank then started to pump air right into Yvette's body as she began to blow up like a balloon. She closed her eyes and then spread her arms out as she expanded larger and rounder. Her flying suit then stretched out wider as her hands started to become absorbed deep into her ballooned suit as well as her hand sinking in like she's in a quicksand.
By the time she was done after being satisfied with how big she is, she spat out the air hose and then started to float away high above the terrain.
"Look at me fly!" laughed Yvette as she flapped her hands. "I don't even need to use the wings on my suit to fly if I'm a balloon!"
Yvette flew around the region of Kalos and over the mountains and buildings from various cities including Lumiose City. She even looked down and could see the people below looking small like ants.
"Everyone down below look like they all used the move Minimize," Yvette giggled as she flipped over a bit in an upside-down position to see below.
Yvette continued to fly around the entire region for a while until she came to the time that a trainer should be around any moment. She decided to float back to her exact spot in the mountains where she was before. But before she could return, she took a deep breath and exhaled all the air out of her system. She flew and whooshed around while deflating until she completely deflated back to her normal size and made a soft landing on her mountain spot.
"That was very fun," Yvette laughed. "I knew I could kill time by floating around while waiting for a trainer to battle."
Just then, a trainer came passing by as Yvette challenged the trainer to a Sky Battle. She will also never forget the moment she experienced herself as a Sky Trainer balloon for the first time.