It was announced by Nintendo that on May 20th, 2014, Nintendo will be shutting down all online services to their prior generation games. Not only will Pokemon be affected, but all Wii/Nintendo DS games as well.
The Pokemon games include:
Pokémon Diamond
Pokémon Pearl
Pokémon Platinum
Pokémon HeartGold
Pokémon SoulSilver
Pokémon Battle Revolution
Pokémon Black
Pokémon White
Pokémon Black 2
Pokémon White 2
My Pokémon Ranch
Pokemon Mystery Dungeon: Explorers of Time
Pokemon Mystery Dungeon: Explorers of Darkness
Pokemon Mystery Dungeon: Explorers of Sky
Pokemon Ranger: Guardian Signs
Pokemon Ranger: Shadows of Almia
Pokémon Conquest
You will, however, still be able to perform online functions through a local Wifi. This only affects Nintendo Wifi.
This means that as of May 20th, you will not be able to perform any online function whatsoever, so be sure to take on any opportunity you can in these games before the service termination.
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