Sid and Arthur were Pokémon hunting in the Pokéstop capital of the world, York.
"350 Pokéstops in such a small centralised area," authoritated Arthur, as if to prove that it was indeed the Pokéstop capital of the world.
"Are we going to have to come up with a load of Pokémon puns?" intimated Sid.
"The Author only knows two Pokémon jokes so maybe we have to."
"Sid thought for a moment, "What do you get if you cross an explosion with a mighty sound wave?"
"Uh huh?" uh huhed Arthur.
"Mmm, very good, now my turn. How do you get 50 Pikachus on a bus?"
"So you've heard it?"
"Well it was one of the two jokes that the Author knew."