Who said "The bond between trainer and Pokémon is unbreakable"?

This quote is attributed to Pikachu.

The bond between trainer and Pokémon is unbreakable - Pikachu

"The bond between trainer and Pokémon is unbreakable"

Pikachu Relationships

"Pika pika!"

"Pikachu!"

"Pika pika chu!"

"I choose you!"

"The key to a happy marriage is communication."

"Marriage is about compromise and understanding."

"Life's greatest treasures are relationships."

"Trust is a luxury I can't afford."