Hidden Power's power and type vary depending on the individual Pokemon using it, ranging between 30 and 70 power. There is no way to change a Pokemon's Hidden Power type or power, so you are stuck with what you have. Hidden Power is always a Special-based move.
Ruby: AZURILL spins its tail as if it were a
lasso, then hurls it far. The momentum
of the throw sends its body flying, too.Using this unique action, one of these
POKéMON managed to hurl itself a record
Sapphire: AZURILL’s tail is large and bouncy.
It is packed full of the nutrients this
POKéMON needs to grow.AZURILL can be seen bouncing and
playing on its big, rubbery tail.