I use quotations because although it is technically considered grinding, it is really tedious and not really worth it. Here’s why. First, you have to make it all the way to cave 25, the last cave, and beat the boss. Make sure you have some friendship essence incase you miss the chest. The chest has 50 lucky coins in it. It respawns every time you kill the boss, meaning, you can get as many lucky coins as you want assuming you don’t miss the chest. Although killing the boss one time alone can be really time consuming.