Nintendo has scheduled further emergency maintenance on servers, to take place early next week.
Affected services include Pokémon, Ninja Gaiden 3: Razor’s Edge, and Warriors Orochi 3 Hyper, with the maintenance window to begin on Monday 25th February.
Information provided by Nintendo is as follows:
From Monday, February 25, 2013 11:00 PM – Tuesday, February 26, 2013 5:00 PM Pacific Time
Pokémon Black Version
Pokémon White Version
Pokémon Black Version 2
Pokémon White Version 2
From Monday, February 25, 2013 4:00 PM – Monday, February 25, 2013 5:00 PM Pacific Time
Match Making, Ranking, etc.
Ninja Gaiden 3: Razor’s Edge
Warriors Orochi 3 Hyper