depends on moves and levels.
if it was to win with disadvantage, i'd say Gardevoir would win because its a fairy and psychic type, and Gallade would loose because its a fighting and psychic, fairy beats fighting
@Anjelo Getalaga Gallade is not better, sorry. It's a good Pokemon and I respect it, it's just a little unfair due to Gardevoir's natural fairy advantage. But seriously, sequels are never better than the original.
Gardevoir has the upper hand with type advantage, and an amazing ability. The speed between the two is nearly equal but it doesn't really matter, one pixilated hyper voice and Gallade's done for. It's not all about looks, you know.