Capturing all of N's Pokemon

Pokemon with N's trainer ID appear after using the Memory Link feature with Pokemon Black / White.

1. Here's a list of Pokemon with N's trainer ID.
2. The list also includes their locations.
3. You can catch his legendary dragon by visiting the ruins of his castle after completing the game and defeating him in a battle, then taking the stone you receive to Dragonspiral Tower.
4. You don't receive anything for catching all of the Pokemon with his trainer ID, but catching his legendary dragon will enable you to catch Kyurem in the Giant Chasm.
5. Yes
6. Yes

Sources:

• Serebii.net: N's Pokemon, Legendary Pokemon
• GameFAQs: FAQ about N's Pokemon