Items

Weapons

Steel Ball		2000 Corlo	Weapon/Thrown at enemies
Stick		1000 Corlo/your house	Weapon/Jumping Slash
Sword		10000 Corlo/Tonka's treasure dungeon	Weapon/Jumping Slash
Corlo's Cane		20000 Corlo/junk pile	Kill ALL enemies on screen. (Best weapon in the game)
Corlo's Sword		50000 Corlo/Final dungeon	As far as I know, used like the normal sword.

Health and Energy raising items

Power Down		3000 Corlo	Raises health and energy by 100, but lowers most stats to 0 (Worthless)
Power battery		500 Corlo	Energy up by 50. It won't work if Stress is high.
Health battery		500 Corlo	Health up by 50. It won't work if Stress is high
pudding		1000 Corlo	Raises trust and health
A Charger		4000 Corlo	Raises Health and Energy by 200, but doesn't work if stress is high.
B Charger		2000 Corlo/junk Pile	Raises Health and Energy by 100, but doesn't work if stress is high.
C Charger		500 Corlo/junk Pile	Raises Health and Energy by 100, but doesn't work if stress is high. Has side effects.

Status Modification Items

AB CPU		5000 Corlo	Resets stats
O CPU		5000 Corlo	Resets stats
B CPU		5000 Corlo	Resets stats
A CPU		5000 Corlo	Resets stats
Confidence Aid		3000 Corlo/final dungeon	Raises your confidence, but lowers your trust. It won't work with high Stress
Sleep Aid		1000 Corlo/upstairs in your house	Pino will go to sleep, and won't wake up till the next day.
Green Chip		10000 Corlo	Sensitivity UP Agressiveness DOWN
Blue Chip		10000 Corlo	Intelligence UP Athletics DOWN
Yellow Chip		10000 Corlo	Athletics UP Intelligence DOWN
Red Chip		10000 Corlo	Agressiveness UP Sensitivity DOWN
Mini Television		30000 Corlo	I don't know much about this item. The clerk says it has 4 diff. programs, but I only see one, which raises your attack but lowers your sensitivity.
turtle charm		10000 Corlo/found in Corlo Forest,kick the rock	Raises your luck and other various stats
Sense Crystal		30000 Corlo	Sensitivity up, but Pino will be craving more attention from you. Attack and Defense down.
Defective CPU		3000 Corlo	Raises Intelligence, but lowers the other stats greatly.
Battle Skull		30000 Corlo	Raises Attack and Defense, but lowers the other stats greatly.
Nami Nami Fruit		5000 Corlo	Changed all my stats to 81, may work differently for you.
Mori Mori fruit		5000 Corlo	Strength up greatly, but Intelligence decreases. Won't work if stress is high.
Bad Book		1000 Corlo	Raises Attack and Defense, lowers Kindness
Encyclopedia		2000 Corlo	Raises Diligence, Reasoning, Imagination, lowers Arm power. Needs to be read in Act 4.
Picture Book		1000 Corlo	Raises Kindness, lowers Attack and Defense
Grammar book		1000 Corlo/your house	Raises Intelligence, lowers Athletics

Miscellaneous Items

Treasure Box		3000 Corlo	Needed to progress in Act 4
Golf Club		5000 Corlo	Used in the hole-in-one contest in the sports event.
rubber ball		500 Corlo/your house	Weapon/Thrown at enemies (Usually used only for Gichuu)
soccer ball		1000 Corlo/found at Corlo Forest	For training Leg Power
Circus ball		30000 Corlo	Training for Pierre's Great Circus
Sit Still		500 Corlo/upstairs in your house	Pino won't move until you give him an order
Konki Candy		3000 Corlo	Pino won't move off and do stuff on his own
Magic Stone		30000 Corlo	Makes you invincible for the next 3 minutes if you use it. (Useful in Act 5)
Mysterious Seeds		1000 Corlo/Can't be bought until Act 4	Nets more money with the fruit sold than the regular seeds.
Flowers		30000 Corlo/Somewhere else that I can't remember	Used in Act 9
Trumpet		3000 Corlo	Used in Act 4
Steel Dumbell		1000 Corlo/your house	Used in strengthening your arms
Sheet Music		3000 Corlo/given by Mimi	Used in Act 6, raises Sensitivity and Intelligence parameters, lowers Aggressiveness.
Hoe		3000 Corlo/Corlo Forest	For hoeing the field, required in Act 3