DS Game Sync problem, have to reset Black on DW, when its been on DW for about a year

[Cobali]

Uhmm... My Black, thats been linked with DW for about a year now, wont let me take my Charmander out, last month, i linked it to my W2's Memory Link, then, 2 days ago, at night, i registered my W2's number into DW, and.... now i have to set up BOTH my Black and W2, I... need to figure out what happened, cause im confused as heck on WHY i need to set BOTH my Black, and W2 versions up. (Especialuy confused on why i need to reset my black version, when i have a Charmander on there...)

Any help would be apriciated... cause i want to access Game Sync normaly on Black... and put a NEW pokemon to sleep....

EDIT: Im an idiot; i forgot the ONLINE buttion existed xD sorry for wasting time on you guys... Dx