Money (Pokémon Dollars) is earned by winning battles and selling items. It's used to purchase items from various shops. Poké Marts sell basic consumables. Boutiques sell clothing. Stone Emporiums sell evolution stones. Herbalists sell cheaper but bitter healing items. Battle Maison exchanges BP for rare items. Managing your finances is important, especially early on. Consider using the Amulet Coin or Luck Incense to double your prize money from battles.
While Pokémon X and Y rely on earned Poké Dollars for boutique fashion, Pokemon TCG Live utilizes a similar multi-currency system where Credits and Crystals unlock specific gameplay rewards.