Money is essential for buying Poké Balls, healing items, and TMs. Here's how to maximize your earnings:

- Amulet Coin: Obtain the Amulet Coin from the Mayor's Mansion in Phenac City. Have a Pokémon hold it during battles to double your prize money. This is the single most effective way to earn money.
- Re-battle Trainers: After completing the main story, some trainers become re-battlable. This is a good source of income and experience.
- Mt. Battle: Completing zones in Mt. Battle provides significant monetary rewards. Repeated runs can be very profitable.
- Sell Unused TMs/Items: While generally not recommended for TMs, if you have excess items you don't need, selling them can provide a small boost to your funds.
Item Acquisition:
- Poké Marts: The primary source for Poké Balls and healing items.
- Hidden Items: Explore every nook and cranny. Many hidden items are scattered throughout the world, often requiring you to interact with specific spots.
- NPC Gifts: Some NPCs will give you items as rewards for talking to them or completing small tasks.
- Battle Rewards: Winning Colosseum tournaments or defeating certain bosses often yields valuable TMs or other items.
Always keep a healthy supply of money and essential items, especially before tackling major dungeons or boss fights.