Digimon World 4 - Platform: Gamecube

Unlimited Items and bits:
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This trick requires your main Digimon as player one and any Digimon 
as player two. Give all your Bits to player two. Then, save player 
two at the Save Keeper. Next, have player two give all Bits to player 
one. After that, have player two quit the game at the Save Keeper, 
but this time without saving. Then, go to Call Keeper and have player 
two join in again with the same Digimon. Repeat this from the beginning 
until you have 9,999,999 bits, both in the bank and pocket. 
You can also use this trick to duplicate items. This is very useful 
if you want to give some rare weapons and armor to a friend.

Double Axe description:
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The game states that Double Axe (all types) is a bash skill weapon. 
However, when you use it you will gain the blunt skill.

Easy experience:
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In single player mode, repeat the tutorial about fifteen times, then 
go to Death Valley. Once there, follow a path and fight some Goburimon; 
do not go across the bridge. Follow the path up and fight the Goburimon. 
They will give 10 experience points each. Break, then get the Gate Chip, 
use it, and repeat. Additionally, go to Death Valley, then to the Fortress. 
When you are inside the guard room, defeat everyone for 32 experience 
points per kill. After all the doors open, go outside and enter the 
fortress again. This must be done two or three times to reach the next level.

Easy tech ups:
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After you have unlocked the "Fortress" in Death Valley, whenever you need 
to equip a new weapon that is too high in tech points, just return to the 
Fortress and fight up and down the tower multiple times. You will receive 
between 10 to 60 tech ups in one revolution.

Agumon:
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Reach level 16 with Guilmon.

Clavisangemon:
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Successfully complete the Undead Yard quest with Veemon or the Item 
Road quest with Dorumon.

Defeating Aprokrimon:
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First, destroy the five spike balls on the posts around him, avoiding 
the fire shots and wind blow. Whenever five flying things come to attack, 
just block. Do not try to jump on the area that he is on, as you will get 
shocked. After the spike balls are destroyed, he will shoot a purple 
attack that follows you. You must run around trying to hit him without 
getting hit. Magic and a gun weapon work well; you do not have to walk 
up to him, but they do smaller damage. Physical attacks are more powerful, 
but you must risk getting close to him.

Dorumon:
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Reach level 16 with Agumon.

Guilmon:
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Reach level 16 with Veemon.

Herculeskabuterimon:
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Successfully complete the Undead Yard quest with Guilmon or the Item 
Road quest with Agumon.

Veemon:
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Reach level 16 with Dorumon.

Wargreymon:
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Successfully complete the Undead Yard quest with Agumon or the Item 
Road quest with Guilmon.

Weregarurumon:
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Successfully complete the Undead Yard quest with Dorumon or the Item 
Road quest with Veemon.