>>32035035This actually makes sense though for the sake of type match-ups.
Aqua Tail description in the games:
>The user attacks by swinging its tail as if it were a vicious wave in a raging storm.No actual water is used in the attack.
While in the anime, the Pokemon's tail actually is covered in water.
The games have a lot of moves that have no logical reason to be certain types, and the energy attack at least make it more plausible that certain Pokemon would take more damage from them than other attacks.