Pokemon Black and White: Walkthrough - Liberty Garden
Liberty Garden, also referred to as Liberty Island, can be accessed by riding the boat at Liberty Pier in Castelia City. It is the west-most pier. You need to get the Liberty Pass through Mystery Gift over WiFi in order to ride the boat. Make sure to stock up on Ultra Balls before you go to Liberty Garden. You will have the chance to catch a Victini at the end of this side quest. Bring Pokemon that are around level 15 or else you will knock Victini out too easily. Pokemon that can Paralyze or cause Sleep are good to have.
You will see a group of people standing by the dock once you arrive. They are being corralled by Team Plasma, who have taken over the island. Walk east past the officer to battle the first Plasma Grunt.
 Team Plasma Grunt |
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To the south is another Plasma Grunt on the dock.
 Team Plasma Grunt |
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There is a vending machine to the west if you need any healing items. If not, continue north toward the lighthouse to battle another Plasma Grunt.
 Team Plasma Grunt |
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Enter the lighthouse and talk to the officer to heal your Pokemon at anytime. Continue north to battle a Plasma Grunt.
 Team Plasma Grunt |
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Walk through the doorway and you will find Victini and a Plasma Grunt. He explains their plans for Victini, but you need to put a stop to it.
 Team Plasma Grunt |
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Unlike most legendary Pokemon, there is not only one chance to catch Victini. If you accidentally run away or knock it out, just exit the room and enter again to make Victini reappear. You still may want to save before interacting with it. Victini is harder to catch than a regular Pokemon because of its legendary status.
Walk outside after you catch Victini. Some police officers will be leading the Plasma Grunts away and Juniper will congratulate you.