Note: This game is also titled Doubutsu No Mori Plus.
This trick requires two Game Boy Advances and a link cable. Connect Game Boy Advance #1 to the Gamecube using your link cable and turn it on. Go to your island (located on the dock at the edge of the ocean). When you finally get to the island, drop off the item or money that you wish to duplicate. Leave the island. When Kapp'n asks if you want to save your island to your Game Boy Advance, select "Yes". After it is done downloading to your Game Boy Advance, you can put it in sleep mode, disconnect it, and set it aside. When you get back to your town, attach Game Boy Advance #2 and turn it on. Leave that screen then immediately return to it. Talk to Kapp'n to go back to your island. After you start leaving you can turn Game Boy Advance #2 off. When you get to your island, pick up the item that you left there then leave the island again. This time when Kapp'n asks you to save your island to your Game Boy Advance, answer "No". When you get back to your town, disconnect Game Boy Advance #2 and connect Game Boy Advance #1 (make sure it is not in sleep mode). Leave the screen and return. Talk to Kapp'n once more. Your island should upload from your Game Boy Advance. When you get to your island, your item will be there again and you will already have it in your pockets. Pick up your item from the ground. You now have two of them. This will also work with multiple items.
Reset the Gamecube during the game. Start the game again and Mr. Resetti will appear to complain. Repeat this to make him more angry.
Talk to the townspeople until they ask you when your birthday is. Most of them will say something similar to "How would you like a train set for your birthday?" Answer "Yes" and you will put in your birthday. On your birthday, one of the townsfolk will be outside your house. He or she will present you with a NES. For example, Virgos will get Donkey Kong.
First, find a glowing piece of earth. Dig it up and you get a money bag. Plant the money bag in the glowing hole and a seedling will sprout, which will grow in to a money tree.
Get your town rating to be "Perfect" for two entire weeks. The Golden Axe is indestructible.
Catch all 40 types of bugs.
Catch all 40 types of fish. Note: There may be more or less.
First, buy two shovels. Find a piece of glowing earth and dig it up. Then, plant a shovel in the glowing earth.
Make sure you cannot carry anymore items when Totakeke gets to town on Saturday nights. Talk to him and he will play a song. Afterwards, he will notice that you do not have room for the Aircheck. He will tell you to return later. Talk to him again, and he will play a different song. Repeat this until you have heard a song that you like, then drop an item. Talk to him again and request the song you enjoyed.
This trick requires at least two memory cards. Have two towns saved, one on each card. At 8:00 p.m. on Saturday, get a song from Totakeke, then go to the other town and get one there. If desired, repeatedly delete the second town, make a new one on the second card, and get a new song each time.
Pay off all your debt to Nook then talk to him. He will thank you for paying it off then ask if you want a bigger house. Answer "Yes" and he will tell you to wait one day. Your house will then be bigger.
When you are talking to residents, talk the same person repeatedly. Talking to them too much will upset them. However, in a few minutes they will get over it. By doing this, they will reveal more of the workings of Animal Crossing to you. You also stand a much greater chance of playing a game, getting free items, or trading things with them.
Another way to anger the residents of the town is to push them around by walking into them, or hitting them with your bug net repeatedly.
One of the best ways to get new items that you cannot buy is to do work for the residents, and do it often. Do their little chores and they will (more often than not) reward you with things that are hard to come by in Nook's store.
Talk to people whenever you are near them. Sometimes they will ask you if you want to take a table or some clothes or other things off their hands. Also, do errands for people often. If there are no errands available you will only have to wait ten minutes.
When the Gamecube logo appears, hold A + B to get to the memory card screen. You can change the system clock to whatever time you wish. Begin the game and you should start at that day.
The game allows you to change the setting before you load it when beginning. When it asks "Are you ready?", the options are "Yes" and "Before I go". Select "Before I go" and it will allow you to change the game's time without changing with the system clock (which also effects other Gamecube games that rely on it) Also, if you have bought turnips to sell them in the Stalk Market and change the system clock or the game time, they may go bad. It depends on the amount of time -- the game remembers.
Note: Play a little every day. While you can reset the game's clock and go to Nook's store, this gets old. Also, resetting the clock disrupts timed events that you do not know about. The game is filled with events that depend on month, day, and hour. It is better to just play the game as it unfolds. You will get more furniture, carpet, etc. this way. When you change the time, it disrupts the chain of events permanently and you may end up actually getting less new things then you would if you just played the game as it was supposed to be played.
If you are not catching the fish you want to catch, move to another section of the map and fish there. Some fish are only found in certain areas.
When fishing, do not actually reel in the fish (press A) until you see the bobber go under the water.
Fish at the ocean in the rain. You have a much greater chance of catching the Coelacanth. They sell for 15,000 a fish. Also, you have a greater chance of catching the Barred Knifejaw and Red Snapper. They sell for 5,000 and 3,000 respectively. Generally, fishing in the rain is much easier, but in the ocean, for easy money. Also, its easier to fish at night.
When bees appear from trees, take out your butterfly net and face the beehive. If you can catch a bee, you can sell it for $4500.
Place orange furniture to the north, green furniture to the south, yellow furniture to the west, and red furniture to the east part of your house.
Note: This trick requires a Game Boy Advance and a link cable. Play the game with the Game Boy Advance attached. Collect as much fruit as possible and travel all the way to the south. Go the pier at the beach. A Kappa will be there and will to bring you to a new island to the south. Get to the new island and drop all of your fruit. Return to the Kappa and leave. Transfer the island to the Game Boy Advance. On the Game Boy Advance, knock on the door to the house of the island animal. After it appears, move a piece of fruit in front of the animal. It will eat it and become happy. Keep repeating this until the animal drops money bags. Feed all your fruit to the animal, then put your Game Boy Advance on standby. Resume the game on the Gamecube. Go back to town, then return and talk to the Kappa again. Your game will now be updated with the Game Boy Advance data. Travel back to the island and collect the money bags.
Go around town with your shovel and hit every rock you can find. One of them should turn red when you hit it. Keep hitting it to get more money.
Every New Year your parents give you 10,000 bells. Change the system date on the Gamecube; or in the Animal Crossing options and change the date to the new year. Check the mail box and you will have 10,000 bells from your parents. Repeat the process, but change the year.
Dig for fossils every time you play. When the museum fills up with fossils, you can make a mint at Nook's or trade with residents for good items with fossils. Skulls of dinosaurs seem to be worth the most, usually bringing in 4,000 to 6,000.
Play the Stalk Market. Turnips do not seem like that much of a commodity, but its gold in the game. You can make a fortune buying Turnips and selling them at the right price.