Dedenne has been confirmed to make an appearance in the upcoming Super Smash Bros for Wii U and Super Smash Bros for Nintendo 3DS games. Masahiro Sakurai (桜井政博), Director of the games, posted on Miiverse that in the upcoming games, Dedenne is hard at work too.
Source:
https://miiverse.nintendo.net/posts/AYMHAAACAAAYUKlLxf9O9A