Power Points are items that can be gained through Brawl Boxes and by buying them in the Shop. Each Brawler has their own pool of Power Points, and once you get enough Power Points, you are able to upgrade them to the next Level. Higher levels of Brawlers require more Power Points to upgrade.
Power Points are primarily obtained from Brawl Boxes. Each box will contain a small amount of Power Points for a random Brawler that you have unlocked. Rarity of the Brawler does not affect how often a box contains Power Points for it; once you have unlocked a Brawler, a box has an equal chance of containing Points for it as any other Brawler.
In the shop, each Power Point costs 2 Coins. For example, 10 Power Points will cost 20 Coins, 32 Power Points will cost 64 Coins, etc. The amount of Power Points you can buy varies with the Daily Offer. Each Power Point offer can only be bought once. Power Point offers change every 24 hours, and after that, they can be bought again.
Some Trophy Road rewards offer Power Points, as well. These rewards come in packs of 25, 75, or 150 Power Points, and they also allow you to choose which brawler's power points you get.
Once you have enough Power Points for a Brawler's level, you can spend Coins to upgrade it to the next level, all the way up to level 9. After enough Power Points to get a Brawler to level 9 are collected, no more Power Points will be found for that Brawler. When all of the player's unlocked Brawlers have the maximum amount of Power Points, Brawl Boxes will no longer contain Power Points, and more Coins will be awarded instead.
To get a Brawler to level 10, you must obtain its Star Power. To find a Star Power, your respective Brawler must be at level 9. Star Powers are found in Brawl Boxes, or they can be bought for 2000 Coins in the Shop when they appear.