>>32866122>contOnce you start your battle don't waste time dodging if you can't deal lots of damage. Just sit and take it. If all of your team gets knocked out, exit the battle. Make sure you have one player sit and dodge like crazy until you can re-enter.
If you beat it, you get rewards like golden razzberries, quick/charge TMs, rare candies, and healing items. After you get your rewards, you get a set number of premier balls you can use to catch the boss mon. Depending on how much damage your team did, you can get extra balls to use to catch it. Either you catch it, or run out of balls. If you run out, it runs away.
When you exit, there's a victory banner on top of the gym instead of a boss.
The end.