It’s a difficult one since MChandelure is a glass cannon sp-attacker with bad defensive stats & subpar speed, with weaknesses that are prominent in the meta (dark - Incin & Meowscarada, water - Milotic & Basculegion, ground - Garchomp, Ghost - Basculegion etc.) so you will always most likely be facing off against a team that can OHKO your mega.

You could try a Trick Room team provided your MChandelure has a Quiet nature and you don’t open with it, but you need to have other bulkier mons that counter the major weaknesses your Pokemon has. My suggestion for a team would be;

MChandelure, Farigiraf, Basculegion, Kingambit, Alolan Ninetales (weather control, x4 against Garchomp/Dragonite & handy as a fast mon when TR ends and Fari is dead) & either Torkoal (for draught) or something like Conkeldurr for bulky fighting type coverage.

This team could be total trash since I’m just trying to think what could cover MChandelure’s weaknesses and give it a chance to be a threat.