Who said "Never give up, no matter how tough the battle."?

This quote is attributed to Pikachu.

Never give up, no matter how tough the battle. - Pikachu

"Never give up, no matter how tough the battle."

Pikachu Perseverance

"Pika pika!"

"Pikachu!"

"Pika pika chu!"

"I choose you!"

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."