Mr. Lock wants the Lock Capsule. He will open it and give you the TM95, Snarl, which was apparently inside. The Lock Capsule is a currently unreleased, event exclusive key item for HeartGold and SoulSilver. It can be transferred to Black and White by using the Relocator, available in the main menu after telling the scientist in the same room a two part secret code; "Everyone Happy, Simple Connection".
No, there are no legendary Pokemon there, just a rare item.
No, unless you want to trade a Pokemon holding an item that works. But just by item, no it doesn't work like that.
The Lock Capsule is a rare item that you obtain in an event in Pokemon HG/SS it contains the attack dark bark for when you obtain zoroark on black and white. To get it from the old games since it is a key item, on black and white you must go to a special building in Castelia City on the most northern road (building ton the left side) and up stairs a scientist will ask you for a password, first reply "Everyone Happy" then he'll ask for a second then reply "Easy Connection". this will give you the relocater to send event items from previous games to this game (Shiny Event Suicune, Raikou, And Entei; Event Celebi for Zorua; and The Lock Capsule). YOU CANNOT SEND ANY OTHER ITEMS OR POKEMON TO BLACK AND WHITE USING THIS METHOD, YOU MUST WAIT TO UNLOCK POKETRANSFER
Route 13 from the guy in the black suit (you get an item a day from him and it can be different or the same one he gave you before)
there is a man in a black soot on route 13, talk to him every day and he will give you a rare item. eventually you will get a black flute. i know because i got one and a white flute of him
Yes. You must give the item to a Pokemon, then trade said Pokemon and unequip said item.
go to route 18
No, there are no legendary Pokemon there, just a rare item.
No, unless you want to trade a Pokemon holding an item that works. But just by item, no it doesn't work like that.
A Key Item is an item in the Key Items Pocket that you can register and use by only pressing the X button.
Yes, because it has an evolution.
The Prism Scale is for Feebas, if Feebas holds the item and is traded it will evolve to Milotic. This item was created when condition for pokemon was removed in Black and White.
You cannot get that item in Pokemon Black.
The Lock Capsule is a rare item that you obtain in an event in Pokemon HG/SS it contains the attack dark bark for when you obtain zoroark on black and white. To get it from the old games since it is a key item, on black and white you must go to a special building in Castelia City on the most northern road (building ton the left side) and up stairs a scientist will ask you for a password, first reply "Everyone Happy" then he'll ask for a second then reply "Easy Connection". this will give you the relocater to send event items from previous games to this game (Shiny Event Suicune, Raikou, And Entei; Event Celebi for Zorua; and The Lock Capsule). YOU CANNOT SEND ANY OTHER ITEMS OR POKEMON TO BLACK AND WHITE USING THIS METHOD, YOU MUST WAIT TO UNLOCK POKETRANSFER
you actually need action replay to delete items in Pokemon Black and white. all you need to to do is click on the item you don't want, and push thrash item. hope i helped! :)
yes
leftovers life orb (in some occasions) quick claw any accuracy+1 item choice specs (only for certain strategies)