Nope, cheats.gbatemp closed a long time ago - it's http://filetrip.net/ now and it's difficult to find good/new AR codes there.
I would recommend DS SCENE ROM TOOL (automatic AR codes update when new) - have many of the codes for BW2 requested here. You get cheat.dat or usercheat.dat files for flash carts, so to browse/edit you need a cheat file program as well.
By the way - have some great legend form codes found on the internet (tested in Black 2, but I'm sure they work in White 2 too). Use at own risk - always make a savefile backup before use. For some of them you need 24 boxes. Don't use them if you don't have 24 or your game will crash. Here's the trick to get 24 boxes: put 1 Pokémon in each of the 8 boxes in last slot, catch a Pokémon and you have 16 boxes. Do the same in 16 boxes and catch a Pokémon - then you have 24 boxes (it worked for me!). Make sure you don't have Pokémon in the last slots in box 1, 8 and 24 before use - or they will be "overwritten"!
Tornadus Therian Form - use Select, put in Box 8
94000130 FFFB0000
B2000024 00000000
E0008C88 00000088
5845FC7E 9E130000
B6B3464B DEF6764F
9A1695B1 C57A1D82
30A07EF3 2B50095F
AE6FF0E3 C9B0FA6D
A1746858 F9EA8204
A1DA570C 70DAAE59
F7F64B32 4E7717CA
C45B0AAB E23C150E
A3B97F6F B793D5A5
A5F3C428 50E49E01
6F4C4F61 1E6478F2
839189C8 91B12F54
1CBE29B5 6DC5B064
FDCCD2DB 00D61C30
575F3C70 E8960E31
4B555CBF BD5B698C
D2000000 00000000
Thundurus Therian Form - use Select, put in Box 8
94000130 FFFB0000
B2000024 00000000
E0008C00 00000088
F9426F72 94350000
36084336 3A189DE3
DDB9940C B5C9A5CE
DAB3DBAB D53BAF18
E1C6F327 EA13AF38
4101F48B 726AA336
923CB576 A9FABCEC
E813336D 5C223FBF
05DF3651 918E679E
47531EF8 99614ABA
2A49DE03 C0215E1E
E5F5048D 65A3C965
4EB1AA1B 89C649CB
D69C5F20 18552BEA
10E74D3C 04CE0BF7
44EA394F 3902884C
C58857FB 654FEF70
D2000000 00000000
Keldeo Resolution Form - use Select, put in Box 1
94000130 FFFB0000
B2000024 00000000
E0001C88 00000088
53CE20F8 EBA40000
DD022D43 A41A0F54
E0D98E81 3DD1EEDB
2821C435 1FCD7535
BF1E0711 E5DCBD7F
AC268047 63DEAC21
230CD46C 2ADF2CA4
01DC4604 CD1C4CDA
3041ABC6 93814FBD
836E2BDA B8BCB14C
D0C070DF 12C88340
E7481A54 49C34930
B9CD2889 B0A0E3D4
9CD78654 180F997E
47646EFD C05B2492
BB9279D6 C7A34D0C
8E0C7B33 B32C57FA
D2000000 00000000
White Kyurem, use Select, put in Box24
94000130 FFFB0000
B2000024 00000000
E0018C88 00000088
87582FF3 E5D10000
4551158B 54A8B2E6
F464B842 9597BA6E
79E6B6D6 06AC5DCB
DE5A9E54 F2495704
8FAB9AD6 4557DE67
2D9897D7 8C31A24B
2FA51C64 DAA66967
7E32778B F61F08C3
89709A8B 42DBFB2F
5BB0F887 2915615E
AC188661 AC750DA1
3E5DF780 D3C8A604
DE03C7AF D781491C
8C9A5C90 4E245DD3
B80FD5A3 D74B41DD
3557B8CE 6EC82445
D2000000 00000000
Black Kyurem, use Select, put in Box24
94000130 FFFB0000
B2000024 00000000
E0018C00 00000088
87582FF3 D6A00000
7D3DE306 63F8BCC6
7E0B2FBC CA0CE080
EBEEFD17 B50D51F8
C00DE823 D95A6443
3034051D ACD0EA88
FACCA2AC 74DA1ACD
E854FCF7 4BEC6E45
3EE259A5 9F1ABA25
23C6EF77 4EFB880C
AB366C1E 43D32083
48629F00 10F49E74
8979874F 3760C9D5
8ECF07C4 EEC382C6
CC2607DB 983D75BB
A3BD73A8 57740679
4821CA79 D28D99A1
D2000000 00000000
Have fun!