They reach the football field, and Bianca sends out:

a cloud of gas,

a regular-looking bird,

and a...weird-looking bird?

"I got these guys on my latest research trip. They're the smallest and mellowest of the bunch. I can answer questions about them if you want, or show pictures of their metamorphosed forms, or you can look closer and pet them."

The cloud of gas fades in and out of visibility. The weird-looking bird(?) spins in place. The regular-looking bird hops slowly but determinedly in Kyeo's direction.

"Do I need to worry about... inhaling... the floating one..."

"Nah, not by accident, Gastly hold their bodies quite tightly together with psychic energy. To breathe in one you'd have to stick your face right in it."

At the mention of his name, the Gastly turns to face Bianca and sticks his tongue out.

The bird moves faster towards Kyeo, taking hesitant little leaps with wings extended. She headbutts his leg gently.

"Awwwwwwww, she likes you!"

"Do I... pet... her?"

"You can! I bet she'd like it."

He will attempt to pet the bird's feathers.

The bird coos! She presses herself more closely into his hand.

"What is she?"

"She's a Starly! Flying/Normal type. Fully evolved form is Staraptor, a popular mount for air travel."

She shows a picture of a Staraptor on her phone.

"Oh, how long will it take to get her that big?"

"Depends how frequently she fights! Like most Pokemon, the Starly line evolve upon gaining sufficient battle experience. Most kids who do their Pokemon journeys find that their starter fully evolves if used consistently over the course of getting eight Gym Badges. That'd be...well, most kids take a year off for it but some just do it over the summer, and those that set out to get all eight over the summer usually succeed. Not sure exactly how much time a day they dedicate to training in that case?"

"The summer is how long on this planet?" She's really very soft. Pet pet.

"Three months. —uh, a little over twelve weeks, with a week being seven days."

Coo coo!

"That's very fast for such a little bird to get big enough to ride!"

"Pokemon grow up fast when they fight a lot!

—if you ever don't want one to evolve, have it hold an Everstone whenever it's exposed to the evolution trigger."

Porygon wanders over to one of the end zones and starts sniffing the ground. Gastly goes invisible and pops back up behind Bianca, cackling triumphantly despite having utterly failed to startle her. Starly will keep happily accepting pets from Kyeo as long as they're offered.