Who said "I may be small, but my heart is mighty."?

This quote is attributed to Pikachu.

I may be small, but my heart is mighty. - Pikachu

"I may be small, but my heart is mighty."

Pikachu Strength

"Pika pika!"

"Pikachu!"

"Pika pika chu!"

"I choose you!"

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."