It depends on the level of your Zoroark, and what you're about to face
Now, this is for your in-game team, and we need to know where you are at in your game and which game it is in. But I think I could help you out a little without knowing those facts.
Although this is an in-game team and Natures and having mixed Pokemon aren't that crucial, you do need at least a slightly good moveset to progress through your game. I think that Zoroark is a solid Pokemon to have on your team and I think you don't need to switch it out for another Pokemon. I suggest having this moveset:
Zoroark @ anything you wish, items are not that crucial for in-game playthroughs (though I do suggest items that increase the power of moves, such as black glasses)
I would have to make four separate movesets for the moves because they vary in each gen
Gen 5 (Black/White/Black 2/White 2):
I know that you said that it has an Adamant nature, but that doesn't matter for in-game playthroughs, you have other Pokemon, it's ok.
Gen 6 (Omega Ruby/Alpha Sapphire/X/Y):
Night Daze
Shadow Ball
Flamethrower
Grass Knot/ Low Sweep
Gen 7 (Sun/Moon/Ultra Sun/Ultra Moon):
Night Slash
Shadow Claw
Flamethrower
Swords Dance
Gen 8 (Sword/Shield):
Night Slash
Shadow Claw
Sludge Bomb
Bounce
Ok! I think that's it. Hope I've helped!