The hint of when you can't work out "Choose a special move once with Nappa" in the EX3 challenge item of the outrageous Saiyan Nappa attack of the event battle.
Low level of EX Nappa
The easiest way is to raise the level of Nappa that can be obtained at the event, but since the enemy's Nappa level is 589-720, even Novice's level 300 Nappa is painful. So think without levels.
Nappa at the beginning
I think that Nappa may die instantly when I put it out in 2nd or 2nd position while Nappa is weak. So at the beginning, let's have Nappa fight first. Personally, the first player is easy to take the initiative.
Take initiative with 2 shooting arts
Your chance is to have two shooting arts in the first one. For the time being, if you use it twice in a row, you can take the initiative with a high probability.
Action up to Special Moves
Once you get the initiative, move forward to boost move + tap attack → shooting or hitting arts while saving costs and waiting for deadly arts.
Special arts after burnishing or tap attack
Even if the deadly arts arrive, if you use it immediately after rushing, it will be avoided at the burnishing step and the distance is too far to hit. It's easy to use after approaching with a short blow-off or burnishing after tap attack.