Question

It says "Gains power each time the user is hit." So, does this mean that only Rage does more damage? Or will all the pokemons moves do more damage.

Answer 1

Actually, Rage increases the user's Attack every time they are hit, even though the game just says the Pokemon's "rage is building".

So if you use Rage then get hit by a move, any other Physical move you use will be more powerful.