I Posted Some Cheats on Cheatsguru but they never came up. (Blue Rescue Team Of course)
So here they are:

Special Missions
When you start the game, before you load your game, go to Wonder Mail and type in the passwords. (F) is the Female sign, and (M) is the male sign.
Password Effect
X?7P(F)?+??XP6RJ?QFJC5?W?? Makes Feebas a wild Pokemon in Blue Rescue Team.
5?2YQW0??T0QJC?(M)FH16WR?W Gives you the Friend Area Sky Blue Plains.
4?9C 33+? ?M7- !P?X S466 C1?W Silver Gummi(Silent Chasm B5F Rank D)
4?C... -1F? 43NJ MF?... 8J?T -W?W Weather Band + ?(Near Uproar Forest B7F Rank C)
??7Y (f)1+? ?-PQ HC?M S6?0 +Q?W Pecha Scarf(Frosty Forest 8F Rank B)
4?MJ 4PT? 0?7Q HF?9 0470 ?5?K TM Roar(Mt. Thunder 5F Rank C)
F?CN 310? 4QR- PS?0 H67R M0?W TM Torment + ?(Lapis Cave B10F Rank C)
4??N 22...? ?Q6J H3?(M) 8470 JN?W Makes Mantine appear as a wild Pokemon in Blue Rescue Team
F?4N +WT? ?+6N FR?J F?66 85?W Makes Roselia appear as a wild Pokemon in Blue Rescue Team
F?434?t?429H90?7H56R8K?(f) Porygon appers in the wild
3?2N 82Y? 4Q83 41?(F) ...65R ...!?W Gives you the Friend Area Boulder Cave.
0?05 760? 4WP4 KX?6 -?05 53?- Gives you the Friend Area Mt. Moonview
6?2+(F)40??QN3PC?Q8JO6SY?F Unlocks Mt. Moonview Friend Area