"It's really really different! Nobody keeps Pokémon in balls! Wooliam, Thunder Wave!"

The hiker's Pokémon moves shockingly quickly and manages to get in a punch before Wooliam can do anything, but Wooliam takes the opportunity to jolt it with electricity. 

"Really? Where do they keep them?"

"Tackle! - sometimes we summon them from other planes by magic and they just go home when the spell ends, or you just have them around all the time, maybe in their own building with stalls if they're too big to live in your house with you. Also people don't battle with them nearly as much, it's a thing but I've never done it before today!"

The hiker's Pokémon is trying to get in another punch before Wooliam can hit it but it's not really working.

Wooliam rams into it! 

"From other planes? How does that work?"

"I have one prepared today but only one so I can't show you without using it up! I'd just cast it and then I'd get a celestial Pokémon from Nirvana to help me. But I'm not very powerful so it wouldn't stay long."

"Wow! I don't think I've ever seen a celestial Pokémon before!"

"I'm not sure if I can get any species that are common here! Usually I'd get a species that also exists on my planet, and it'd just be especially pretty and maybe a metallic color - keep going, Wooliam, you've got it! - but maybe there are celestial versions of species here too that I could summon now I know about them."

Oh, like how Alola has a special prettier version of Ninetales. That makes sense.

Wooliam goes to tackle the hiker's Pokémon—

"Riolu, Counter!"

The Riolu braces itself, and as Wooliam runs into it, it catches some of Wooliam's momentum and turns it back on Wooliam.

Wooliam falls to the ground, exhausted. (The Riolu looks like it's decently damaged, though.)

Oh no! "I guess you win?"

He blinks a little. "—It looks like you've got two more Pokémon with you, you can keep battling as long as you've got Pokémon left to fight."

"If that's how it works, I guess!" Out comes Pauta! ...she doesn't actually know what Pauta can do so hopefully Pauta can figure it out.

Pauta will attempt to scratch at the Riolu! Pauta is notably worse at fighting than Wooliam, but between Wooliam's earlier efforts and the paralysis, she's able to take it down before it can hit her back.

"Nice work!" 

He offers her some paper money.

"- is there always an implicit bet on these things?"

"Huh. You know, I never really thought about it like that."

"I don't actually have any local money, just some silver I had on me when I was transported to this planet, so I won't turn you down, but it's good to know - is this the usual stake -" She counts it up. "Can you scoot your Pokémon a little closer and I'll heal the lot of them?"

"There's not a single stake that's usual — let's say I beat a ten year old and they hand me a fifty-Pokédollar coin, I'm not going to start complaining, you know? I guess maybe you don't know, if you're an alien. Three or four hundred would be pretty standard around these parts."

He moves his Riolu closer.

She holds forth her rainbow bird and channels.