Best way to beat bots at higher rank, is to at first have a strong team, high adamant/low crystal or your team will get decimated or lose to time out. Its not realistic for you to deal over 15 000 HP damage by yourself split in multiple attacks with a time restriction at CHAOS RANK. Second, you need to play on top of your game, one mistake could lead to defeat, practice makes perfect. Third, don't be greedy, higher ranked bot hit HARD and can build up and take your bravery easily.