We're running away! We stole some gold!:
Activated all skills.
You need to farm all the necessary coins to make every possible coin combo (skill) in the coin set menu. Most likely this results in farming all the coins since there’s a huge chance that you’ll need the last coin to buy a coin combo. The fastest way to farm coins is to do Main Log’s episode 11 over and over again and do all the QTEs to get your BEAT (score) over 700 since every 150 points nets you an extra coin except for the 5th coin which you only need an extra 100 points for and also gives you a good chance of being a rare coin. Another option is doing Zoro's episode 7 in another log over and over again if you prefer levelling your other characters and at the same time it will also help you towards the 100,000 kills trophy.
How to get a score of 700+. Your BEAT starts counting from when you reach 50 KOs, every KO during your special attacks gives you an extra point so even if you haven't reached 50 KOs a KO will give you a point so spam your specials whenever possible.
Some good coins combos to equip are:
Luffy – Zoro – Kuma: Harder to get flinched by enemies. During BEAT, getting knocked down or blown away once by enemies does not end it.
Any 3 of the following: Zoro, Brook, Mihawk, Hacchan, Kaku, New World Zoro: increased experience rate.