Who said "The greatest victories come from within."?

This quote is attributed to Pikachu.

The greatest victories come from within. - Pikachu

"The greatest victories come from within."

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."