As a new era of Pokemon begins, Nintendo is severing all online services of the previous generation of Pokemon games.

According to Serebii, the following titles will no longer have online functionality as of May 20, 2014, regardless of the console you play on.

Pokemon Diamond
Pokemon Pearl
Pokemon Platinum
Pokemon HeartGold
Pokemon SoulSilver
Pokemon Battle Revolution
Pokemon Black
Pokemon White
Pokemon Black 2
Pokemon White 2
My Pokemon 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.

But worry not, if you're an owner of Pokemon X and Y, Pokemon Bank and Poke Transporter, they will remain functional as a part of the 3DS and Wii U generation.