I know it isn't a good move for him but I wanted to know because in the anime, Zoey's Gallade knows it. Though anime mixes things up they usually only teach them moves they can know.
Gallade does learn Vacuum Wave, in Gen 4 through Move Tutor.
How to change your username How to add a user avatar Why was my post hidden? Question etiquette Flags vs Downvotes Anime FAQ Official PokemonDb League
Type a Pokemon name, type, move or ability to see instant results.