Carbos for EV stats as well as the hold item Power Anklet
Quick claw, may let your pokemon attack first and choice scarf will also increase your speed but limit you to only one attack.
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The Pokemon that has the greater speed attacks first, but there are some moves that attack always first in the battle and some items that increase the chance of attacking first like the Quick Claw
You can only breed pokemon, not items. Items aren't alive!
if the first Pokemon in your party has the ability keen eye it increases the chance of wild Pokemon holding items when u find them
In a way, yes. You can give items to your Pokemon and trade them.
Cant you can only on Pokemon heartgold search for how do you clone items in Pokemon heartgold and my answer will be there