Shadao
Aim to be a Pokémon Master
Yes.
But.
The size difference is basically the drawing point in David and Goliath, not power. Ignore the size and the story loses its entire purpose.
Goliath was said to be the champion and greatest fighter among the Philistine army wearing 150 pounds of bronze armor, while David was said to be just a teenager wearing zero armor to protect himself.
Power is what makes it a David and Goliath story.