Poke Ball - Captures Basic Pokemon in Battle
Great Ball - Has a better chane of catching pokemon
Ultra Ball - Has a even better chance of cacthing a pokemon
Safari Ball - You need this to capture Safari Zone Pokemon
Master Ball - This ball will capture any Wild Pokemon 100%

Antidote - Cures poison
Burn Heal - Soothes Burns
Ice Heal - Heals frostbite
Awakening - Wakes up a sleeping Pokemon
Paralyz Heal - Heals paralyzed Pokemon
Full Heal - Cures all conditions

Potion - Restores 20 of your Pokemon's HP
Super Potion - Restores 50 of your Pokemon's HP
Hyper Potion - Restores all HP
Max Potion - Completely restores HP
Full Restore - Completely restores HP, and heals all conditions

Revive - Revives a fallen Pokemon, restores half HP
Max Revive - Revives a fallen Pokemon, and completely restores HP

Rare Candy - Increases a Pokemon's level by one
HP Up - Increases Pokemon's HP level
PP Up - Increases Pokemons PP (Power Points) level

Protein - Increases Attack Power
Iron - Increases Defense
Carbos - Increases Speed
Calcium - Increases Special Ability

X Attack - Increases Attack during a battle
X Defend - Increases Defense during a battle
X Special - Increases Special only during battle
X Speed - Increases Speed during battle
X Accuracy - Increases Accuracy in a battle
Guard Special - Disables enemy Pokemon's Special Attack
Dire Hit - Increases chances of critical hits

Bike - Use this to travel quickly

Escape Rope - Escape from Caves

Repel - Keeps weak pokemon from attacking
Super Repel - Works longer than Repel
Max Repel - Keep weak Pokemon from attacking even longer

Poke Doll - A doll that distracts wild pokemon so you can run away

Silph Scope - Allows you to see Ghost Pokemon
Poke Flute - Wakes up a sleeping Pokemon in and out of battle

Old Rod - Catches level 5 water pokemon
Good Rod - Catches level 10 pokemon
Super Rod - Cathces level 15 pokemon

Item Finder - Helps you find hidden items
Exp. All - Shares Experience with Pokemon that didn't fight

Coin - Use these at the Game Corner to play the slots
Coin Case - Holds up to 9,999 Game Corner Coins

Fresh Water - Restores HP a little in battle
Soda Pop - Restores some HP in battle
Lemonade - Restores a lot of HP in battle

Fire Stone - Evolves certain Fire Pokemon
Thunder Stone - Evolves certain Electric Pokemon
Water Stone - Evolves certain Water Pokemon
Leaf Stone - Evolves certain Grass Pokemon
Moon Stone - Evolves certain pokemon

Helix Fossil - ressurect for Omanyte
Dome Fossil - ressurect for Kabuto
Old Amber - ressurect for Aerodacltyl