Easy Money
Go to Apple Market and kick the can into the bakery. The woman behind the counter will give you 1000 Zenny. Enter any shop and exit. The can will reappear. Repeat this as many times as needed. Note: This will still work when everyone leaves.
Go to the market just before the main city (the junk store is found here). At the south entrance/exit, you can find a small yellow can on the ground next to a garbage pail. Start kicking it until you put it behind the counter of the larger of the two bread stores. A "Nice shot! Bonus 1000 Zenny" message will appear, followed by Remember to recycle your empty cans". You can exit and re-enter the market and repeat this as many times as needed.
Play the beast hunter game at the Studio to get 4000 Zenny for completing grade A. Repeat this as many times as needed.
Once you have destroyed the Bruno robot in Old City, go in the gate down to the Main Gate. Destroy the fire breathing dog. Collect the Zenny with the Vacuum Arm. Exit where you entered, and repeat as many times as needed. Before that though, there are "beehives" in the Cordon Ruins, where you get the Yellow Refractor. As long as you do not destroy the "hives" themselves, they unleash a unlimited number of flying enemies.
Use a high powered gun such as the Shinning Laser in places like the Underground City, Uptown, and Downtown to get more money than with the Buster Gun.
Start with Jet Skates and Buster Max
Successfully complete the game under the hard difficulty setting with a time less than 8 hours. The Jet Skates and Buster Max will already be available at the start of the next new game.
Easy difficulty
Successfully complete the game under the hard difficulty setting to unlock the easy difficulty setting. Note: The Bust Max will be available at the start of a game in easy mode.
Hard difficulty
Successfully complete the game to unlock the hard difficulty setting.
Completing grade A
Play the beast hunter game at the Studio to get 4000 gold for completing grade A. Repeat this as many times as needed.
Instant color change
After defeating Bruno go to the flutter turn on the tv and it will say that there was a bank robbery. Go to downtown and you'll see a red car coming shoot it in the trunk until it blows up, then a suitcase will fly out of it go pick it up and DON'T talk to the detective instead walk to the south door and it will ask if you wanna keep the money say yes and you'll get 200,000 zenny plus you'll instantly change to a black megaman.
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