Ever since episode One we have seen pokemon from the next generation. Excluding 4th Generation IIRC. So will they show 6th Generation pokemon in the anime before the actual 6th Gen coverage and what not starts? Of course pending there is a sixth generation that is. These are the appearances from anime and movies of pokemon that come from the succeeding generation.
Anime:
Episode 001 - Ho-oh
Episode 050 - Togepi
Episode 103 - Elekid
Episode 205 - Kecleon
Episode 255 - Wynaut
Episode 265 - Blaziken
Episode 274 - Wingull, Pelipper, Sharpedo, Wailmer(in anime)
AG Episode 117 - Munchlax (in anime)
AG Episode 147 - Mime Jr. (in anime)
AG Episode 156 - Bonsly(in anime)
AG Episode 184 - Chatot (in anime)
AG Episode 185 - Weavile(in anime)
AG Episode 192 - Electivire
Movies:
Power of One - Lugia & Slowking
Pokemon Heros - Latios, Latias, Wailmer
Destiny Deoxys - Munchlax
Lucario and the Mystery of Mew - Lucario, Bonsly, Weavile, Mime Jr.
Pokemon Ranger and the Temple of the Sea - Manaphy, Mantyke, Buizel, Chatot
Anime:
Episode 001 - Ho-oh
Episode 050 - Togepi
Episode 103 - Elekid
Episode 205 - Kecleon
Episode 255 - Wynaut
Episode 265 - Blaziken
Episode 274 - Wingull, Pelipper, Sharpedo, Wailmer(in anime)
AG Episode 117 - Munchlax (in anime)
AG Episode 147 - Mime Jr. (in anime)
AG Episode 156 - Bonsly(in anime)
AG Episode 184 - Chatot (in anime)
AG Episode 185 - Weavile(in anime)
AG Episode 192 - Electivire
Movies:
Power of One - Lugia & Slowking
Pokemon Heros - Latios, Latias, Wailmer
Destiny Deoxys - Munchlax
Lucario and the Mystery of Mew - Lucario, Bonsly, Weavile, Mime Jr.
Pokemon Ranger and the Temple of the Sea - Manaphy, Mantyke, Buizel, Chatot