Goronda, the Aggressive Pokémon. Goronda is the evolution of Pancham and is Fighting/Dark-type. It has the ability Iron Fist. It knows Hammer Arm.
Maika, the Revolution Pokémon, is Dark/Psychic-type. It has the abilities Contrary or Suction Cup. Its evolution is called Karamanero.
The pink bird is called Shushupu and is Fairy-type. It is the Perfume Pokémon and has the ability Healer. It knows the move AromaTherapy. It is exclusive to Pokémon Y, along with Skrelp.
Peropuff, the Cotton Candy Pokémon, is Fairy type. It has the new ability Sweet Bell which prevents it from falling asleep. Peropuff also knows a new move called Drain Kiss. It's exclusive to Pokémon X, along with Clauncher.
Yveltal is Dark/Flying and Xerneas is Fairy. Yveltal has the ability Dark Aura, which powers up Dark type moves and Xerneas has Fairy Aura, which powers up Fairy Type moves. Yveltal's Signature Move is called Death Wing and Xernears' is called Geo Control.
Misc: There's a new Gym leader, with the robot arms, called Shitoron while the other Gym Leader is called Zakuro. Prof. Platane is the new Professor, and he may battle you. Team Flare/Flair are the new antagonists, they aim to steal money. There is a new mechanic called "O-Power" which can help you throughout the game, similar to Pass Powers.