I think it’s obvious this event needs some changes,so lets throw some ideas in the hat.
Ok so you start a fight you have to end that battle to progress. Damage could be carried over?
Positives:
It would stop it being so easy for people to pick and chose battleship suit their tactic. lower levels would have a chance to continue after a certain point accumulatively so time invested is worthwhile.
Feels like the dungeon challenge. I think the way to go is give everybody a choice of the same 20-25 mons, everyone gets to make a team from that, I think an event like that would more clearly show skill
The best way is to have a set level that when reached you can’t go further and have everyone that reaches that level get the same prize a legendary potion the first player that reaches it gets 3 potions