Who said "Never give up, no matter how tough things get"?

This quote is attributed to Pikachu.

Never give up, no matter how tough things get - Pikachu

"Never give up, no matter how tough things get"

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."