EVs/IVs/Nature?
Basically since this is an in-game team, I won't be a total ass.
Neutral natures are always bad due to not boosting anything (and the fact that DP is an offensive metagame). Sassy on Luxray is bad as well, since it lowers speed for special defense. Luxray should either be mixed or CB. Salamence should be DD+Outrage or Mixmence. Lucario should be Specs or SD.
But since it's an in-game team, I assume that you'll want to use it in the Frontier. Here's mine.
Mesprit @ Choice Scarf
Ability: Levitate
EVs: 252 HP / 4 Def / 252 Spe
Nature: Bold
-Trick
-Thunder Wave
-Charm
-Flash
Drapion (M) @ Black Sludge
Ability: Battle Armor
EVs: 252 HP / 56 Def / 196 SpD / 4 Spe
Nature: Careful
-Crunch
-Acupressure
-Substitute
-Rest
Garchomp (M) @ Lum Berry
Ability: Sand Veil
EVs: 252 Atk / 4 Def / 252 Spe
Nature: Jolly
-Earthquake
-Outrage
-Substitute
-Swords Dance
Basically Trick the AI into one move, preferably a non attacking move. If all goes well, Mesprit will Trick its Scarf, twave the opponent, possibly Charm it, and Flash. Drapion is sent in to get stat boosts and is immune to crits. Garchomp is just self explanatory. I got 1500 wins with this team, so yeah.