Super Smash Bros. for Nintendo 3DS / Wii U

Super Smash Bros. for Nintendo 3DS / Wii U is the fourth and upcoming installment of the Super Smash Bros. series. Super Smash Bros. for Nintendo 3DS will be the very first Super Smash Bros. game on a handheld system. It will be released for the Wii U and the Nintendo 3DS system in 2014.

Pikachu
Pikachu was confirmed to return for Super Smash Bros. for Nintendo 3DS / Wii U from the beginning on the project started.

Lucario
Pikachu was confirmed to return for Super Smash Bros. for Nintendo 3DS / Wii U from January 30th, 2014.

Pokéball Pokémon

 * Palkia
 * Dedenne

Pokémon Stage Hazards

 * TBA

Unknown Role

 * Xerneas

Nintendo 3DS Version
Lumiose City was confirmed to appear as a stage for Super Smash Bros. for Nintendo 3DS / Wii U for the Nintendo 3DS version and Sakurai mentions in Miiverse that the fighters will be fighting on Prism Tower.