It was mentioned in the show that he's still going around and collecting badges and ribbons. Perhaps we'll see him in person in the near future, most likely in the Grand Festival and/or Pokemon League.
Last time i saw Nando was in ep 106, in the first 30 seconds u find out Kenny has 3 ribbons and Nando has 4
You think that? I never really saw the hype to Nando.I think its kinda funny how the beginning of DP built him up as if he was going to be this major rival to both Ash and Dawn, and that we would see him competing in Contests and Gyms...and he completely disappears.