After multiple runs, the below has been found to be the most consistent setup for completing EX Challenge: Skyla (Very Hard).

Turn-by-turn Strategy

1) All players start with Phoebe & Dusclops and cast Dire Hit All 1x to maximize DPS.

2) All players should repeatedly use Shadow Punch until the first Unity Attack. Ideally this happens before the third Hex cast from the enemy team.

Unity Attack 1!

3) Use a 3x Ghost (Dusclops) Unity Attack.

4) Immediately queue up another round of Shadow Punch 1x from all players.

5) Host Dusclops should then use Unbreakable Bonds! 1x to restore energy / buff Attack, while two guests continue using Shadow Punch.

Unity Attack 2!

6) The Second Unity Attack (3x Ghost – Dusclops) should happen right before Skyla’s Sync Move, and should leave only Skyla on the field.

7) If below 1/2 HP: Use Double Edge to maximize DPS.

If above 1/2 HP: Use Shadow Punch.

8) Skyla’s Sync Move will hit.

9) When Dusclops faints, Lycanroc should be sent out. Immediately use Hard as Diamonds! 1x, followed by Stone Edge repeatedly.

10) If Dusclops survives, cast another Unbreakable Bonds! 1x to buff ally Lycanrocs. Eventually Dusclops will die to Brave Bird, and your Sync Move should be ready (but not used yet).

11) Once the surviving Dusclops faints, immediately use Olivia & Lycanroc’s Sync Move to keep aggro.

Unity Attack 3!

12) The third Unity Attack should be done with Lycanroc (as many Lycanroc as are alive).

13) After Unity, use Sync Moves for all remaining Lycanrocs to take advantage of Sync Move stat bonuses.

14) Finish them off with Stone Edge!