Pokemon Black and White Walkthrough Part 11: Nacrene City (part 2)

continued.....

After beating Lenora                                                                        

Step 7: Team Plasma steals the Dragon Skull
When you deafet Lenora the assistant director, Hawes, comes in and telles you that Team Plasma has invaded the bulding. Go and check it out.

Step 8: Meet the Castelia City Gym Leader, Burgh
Follow Lenora outside when she chases Team Plasma and you will meet Burgh. Lenora checks the east side of the city for Team Plasma while Cheron and Bianca, who arrived earlier, gaurd the museum.

Step 9: Head to Pinwheel Forest with Burgh
Lenora askes you and Burgh to get the Dragon Skull that Team Plasma stole, so head west and hurry to Pinwheel Forest.

Step 10: Bianca gives you a Dowsing MCHN
Before you head to Pinwheel Forest, Bianca stops you and gives you a Dowsing MCHN which lets you search for invisible items. With that in hand, head onward!