Read the following hints carefully and use them to get what you want!
To unlock Bonus dungeons, you should complete the game. Then you will get the Desert Region, Waterfall Pond and Wyvern Hill dungeons unlocked.
To unlock special missions, go to the main menu (Wonder Mail) and enter one of the following passwords. When you complete a mission, you will get the corresponding bonus:
200 Poke and TM 31: ??-f h?f? ?3p? q??+ 8?76 T8??
400 Poke and Heal Ribbon: f?rp f?...? ?+7? ct?h 64?0 r???
Facade (TM42): ??nm x60? 4?p6 h??2 k?70 cf?1
Friend Area: 6?2y 5!+? 45n7 -!?f k4f5 !r?w
Red Gummi: 4?1n 5!y? ?q6+ ps?f 8?60 ...[Male]?w
Special Band: 4?c0 w7+? 4+7j 55?9 f4?0 5s?t
500 Poke: 1??9 4wt? 0f9j nf?9 7770 +8?w
Feebas is a wild Pokemon: X?7P [Female]?+? ?XP6 RJ?Q FJC5 ?W??
Black Gummi: 4?mx xkx? 14ph y??f k?6r mc?[Female]
Weather Band: ??1y 4!f? 01pc jf?9 -4?0 -j?w
Unknown: ??-F H?F? ?3P? Q??+ 8?76 t8??
Max Elixir: 4?mf 87t? ?3n4 [Female]r?2 -?6r 8c??
Power Band: 1?cx wkt? 468x ...!?y 0??6 05?[Male]
Purple Gummi: 1?kn 42x? ?+6[Male] [Male]h?f f460 5s?w
Friend Area Sky Blue Plains: 5?2Y QW0? ?T0Q JC?[Male] FH16 WR?W
The following hint will help you to find the location of items required for Pokemons’ evolution:
Deepseatooth: Grand Sea 15F or Far-Off Sea (upper floors)
Sun Ribbon: Wyvern Hill 20F (Key required)
Dragon Scale: Wyvern Hill 29F - 30F
Metal Coat: Southern Cave 49F - 50F
Beauty Scarf: Western Cave 59F (Key required)
Link Cable: Solar Cave 10F (Key required)
Lunar Ribbon: Northwind Field 20F (Key required)
Fire Stone: Fiery Field 29F
Leaf Stone: Kecleon Shop in Wish Cave
Deepseascale: Grand Sea 15F or Far-Off Sea (upper floors)
Thunderstone: Lightning Field 29F
Moon Stone: Solar Cave or Kecleon Shop in Wish Cave
Upgrade: Kecleon Shop in Wish Cave
Water Stone: Northwind Field 29F (Key required)