Cheats for Harvest Moon 3 (GBC)

Unlimited fruits and vegetables
Go to the grassland and pick all the fruits and vegetables there. Leave, then return. The fruits and vegetables you just picked should be there again. You can pick them until your inventory is full. Go home and put them into your storage area to sell. You can repeat this several times.

Secret Power Berry
Wait until the mountain/volcano erupts. Go to the mountain. Go inside the mountain and look on the far right side to see two pillars off the screen. Try to go in between them, and keep going to the right in the dark until you get to a point where you cannot walk any farther. Then, go up until you see a Harvest Sprite from the original Harvest Moon game. Talk to him and he will asked to be left alone and give you a Power Berry. Note: Do not try to give him anything, as it is a waste of time.

Free movies
When you have enough money to see a movie, go to the movie theater and save the game. Then, pay for the movie and watch it. After its done, shut off the Game Boy Color, turn it back on, and resume playing. You will be outside the theater, with nothing missing.

Fishing pole
Befriend the fisherman. He is the man directly to your left (when facing the screen) who always talks about fishing at the beginning and end of the day (not the girl who wears the red bandanna and loves fish). One day he will ask to borrow your hammer (or another tool). Answer "Yes" and return to him in a week or so. He will give you back the hammer as well as an old fishing pole in thanks.

Fastest and worst ending
Start a new game and select the boy character. When the Mayor asks you to help with the farm, answer "No" to every question. The game will state that the farm on the island was closed down and the game will end.

Quicker jobs
Hold A then release after three seconds. You will do things much better then before. Note: This only works when your chosen tool is over level 1.

Extra money
When you start the game, get the money from the fireplace. Plow all the ground out in the field and in its place, grow grass. It should only take one day and you will have more than 7,000.

Pak
Sometime during the first year around the 16th of Spring, go to the forest where you normally can fish for the King Of The Lake. You will find an egg. Approach and try to pick it up. Text will appear stating something similar to "If you don't take it, it will be eaten by wild animals". Select "Yes" and take the egg. After about a year it will hatch. Once again, text will appear. Your partner will say "Oh..??? An egg hatched... How cute! He thinks you're his mom... Oh! Why don't we name him 'pak' ?! Yes! He's a pak!". Pak lets you talk to animals on the farm and perhaps makes all of your crops (Tomatoes, Corn, and Watermelon) ripe for harvest on his date of birth.

Unlimited money
Note: This trick requires any number of two objects, for example a Cherry and an Egg. First, call the Farmers Union and select your first item (Cherry). When asked to specify the amount, press Down, B. Select your other item (Egg) and press Down. You will have one item less than the first item (Cherry). Sell these to the Farmers Union. Call them again and you will have about 50 of the second item (Egg). Select your second item (Egg) and press Down until you have 0. Press Down again and you will have 99 of that item. Sell them, or you will lose them. After you sell them, you will have about 20. Repeat the trick.