Tell us witch time and grass to get him in I really need nincada!
Nincada is only found at the Bug-Catching Contest in Johto's National Park. Which is a competition held every Tuesday, Thursday, and Saturday.
I found it in the short grass area in the bug catching competition. I forget which time though... Sorry :P
I do believe that you can catch it at night in the bug catching contest.
Can't you tell more about where it is like whitch grass and what time of the day to get him