Dragon Dance M-TTar is used as a wincon, after clearing out the main threat it struggles the most against. Use this mon on hyper-offensive/balanced playstyles, making the opponent second-guess which set it could be. Use dragon dance when possible in order to maximize damage output. Use whichever "punch" move according to the other mon's movesets. Pairs well with hazard removers such as landorus-t, wish passers such as alomomola, and fast choice specs users like dragapult.
252 evs in attack and speed, along with a jolly nature allows for the fastest speed stat. Alternatively, you could use adamant nature instead to maximize attack state.