[He takes about two minutes just going through the list and thinking up of possibilities.]
Morty has Pokémon at about levels forty to fifty so you definitely have the level advantage with three of your Pokémon, even if you don't bother to use dark moves to your advantage.
But since your Golurk and Gardevoir are both weak to ghost type moves despite the moves they have, I'd say this would be a problematic battle on your end. However, if you train your Mawile more, she will have a good chance against the ghosts.
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[He takes about two minutes just going through the list and thinking up of possibilities.]
Morty has Pokémon at about levels forty to fifty so you definitely have the level advantage with three of your Pokémon, even if you don't bother to use dark moves to your advantage.
But since your Golurk and Gardevoir are both weak to ghost type moves despite the moves they have, I'd say this would be a problematic battle on your end. However, if you train your Mawile more, she will have a good chance against the ghosts.