Ash, Misty, Brock and Pikachu stop everything, because it is Oriana's birthday.
"You almost forgot Oriana's birthday?!"
"...Pika?"
"Birthdays are a bit like journeys. You never know exactly what's going to happen."
"You've officially levelled up!"
"I was checking it for poison."
"Happy birthday, Oriana!"
"Hope this year is your greatest adventure yet!"
You're the guest of honour. They stopped a whole journey for you. Pikachu made fireworks.
Gotta celebrate 'em all!