These bonuses are unlocked by going to 'Wonder Mail' at the 'Main' menu and entering any of the codes listed below and then completing the corresponding mission.

Unlock 100 Poke and Roselia:
Enter F?4N +WT? ?+6N FR?J F?66 85?W

Unlock 200 Poke and TM 31:
Enter ??-f h?f? ?3p? Q??+ 8?76 T8??

Unlock 400 Poke and Magikarp:
Enter X??S ??X? 468? *+?? 9756 SY??

Unlock 400 Poke and Heal Ribbon:
Enter f?rp f?...? ?+7? Ct?h 64?0 r???

Unlock 500 Poke:
Enter 1??9 4wt? 0f9j nf?9 7770 +8?w

Unlock Power Band:
Enter 1?cx wkt? 468x ...!?y 0??6 05?[Male]

Unlock Weather Band:
Enter ??1y 4!f? 01pc jf?9 -4?0 -j?w

Unlock Purple Gummi:
Enter 1?kn 42x? ?+6[Male] [Male]h?f f460 5s?w

Unlock Red Gummi:
Enter 4?1n 5!y? ?q6+ ps?f 8?60 ...[Male]?w

Unlock Black Gummi:
Enter 4?mx xkx? 14ph y??f k?6r mc? [Female]

Unlock Facade (TM42):
Enter ??nm x60? 4?p6 h??2 k?70 cf?1

Unlock Friend Area:
Enter 6?2y 5!+? 45n7 -!?f k4f5 !r?w

Unlock Friend Area Sky Blue Plains:
Enter 5?2Y QW0? ?T0Q JC?[Male] FH16 WR?W

Unlock Feebas is a wild Pokemon:
Enter X?7P [Female]?+? ?XP6 RJ?Q FJC5 ?W??

Unlock Max Elixir:
Enter 4?mf 87t? ?3n4 [Female]r?2 -?6r 8c??

Unlock Special Band:
Enter 4?c0 w7+? 4+7j 55?9 f4?0 5s?t

Unlock Trawl Orb:
Enter X?7P *?+? ?xp6 RJ?Q FJC5 ?W??

Here's a sneaky little trick that will prevent you from dying. Just before you go on a rescue 'Save' the game then if you are killed quickly turn the power off of your DS and you'll find when you turn it back on you will still be alive. On long missions like Groudon, Rayquaza and Articuno where it can be difficult to complete the second part because you've lost a lot of your items this little trick comes in very useful.

These are obtained when you complete a certain task in the game. Below is a list of the statues and the corresponding task need to be completed to unlock them.

Unlock Lucario Statue:
Get 15,000 Rescue points and earn the 'Lucario' rank.

Unlock Bonsly Statue:
At the Makuhita Training Dojo complete ALL 21 mazes.

Unlock Mime Jr Statue:
Complete a * (starred) ranked mission. This will be a 99 floor dungeon.

Unlock Weavile Statue:
Complete a * (starred) ranked mission. This will be a 99 floor dungeon.

The following is a list and their location of items in the game that some Pokemon require to evolve. Some of the items require that you have a key.

Sun Stone:
Solar Cave

Fire Stone:
Fiery Field 29F

Metal Coat:
Southern Cave 49F - 50F

Moon Stone:
Solar Cave or Kecleon Shop in Wish Cave

King's Rock:
Kecleon Shop in Wish Cave

Leaf Stone:
Kecleon Shop in Wish Cave

Deepseascale:
Grand Sea 15F or Far-Off Sea (upper floors)

Deepseatooth:
Grand Sea 15F or Far-Off Sea (upper floors)

Dragon Scale:
Wyvern Hill 29F - 30F

Thunderstone:
Lightning Field 29F

Upgrade:
Kecleon Shop in Wish Cave

Link Cable:
Solar Cave 10F (Key required)

Beauty Scarf:
Western Cave 59F (Key required)

Water Stone:
Northwind Field 29F (Key required)

Lunar Ribbon:
Northwind Field 20F (Key required)

Sun Ribbon:
Wyvern Hill 20F (Key required)

When you have defeated Rayquaza unlock the following dungeons by completing the corresponding task.

Unlock Mt.Faraway:
Successfully clear Northwind Field

Unlock Northwind Field:
Successfully clear Lightning Field

Unlock Lightning Field:
Successfully clear Fiery Field

Unlock Pitfall Valley:
Successfully clear Northern Range. Unlock Meteor Cave:
Befriend Lugia

Unlock Western Cave:
Befriend Ho-Oh

Unlock Northern Range:
Have friend area Southern Island.

Unlock Desert Region:
Have friend area Furnace Desert.

Unlock Southern Cavern:
Obtain friend area Rock Cave. Unlock Far-Off Sea:
Purchase Calm Sea friend area.

Unlock Grand Sea:
Purchase Calm Sea friend area.

Unlock Darknight Relic:
Purchase Secretive Forest friend area.

Unlock Joyous Tower:
Successfully clear Pitfall Valley. Must have Blue Sky Meadow friend area.

Unlock Purity Forest:
Successfully clear Pitfall Valley. Must have Blue Sky Meadow friend area.

Unlock Howling Forest:
Have Blue Sky Meadow friend area and complete Smeargle's rescue mission from the bulletin board.

Unlock Murky Cave:
Successfully clear Stormy Sea and rescue Medicham. Talk to Ekans and Medicham after saving Medicham.

Unlock Buried Relic:
Beat Stormy Sea and you will later receive mail talking about ruins being uncovered. Talk to Lombre then Shiftry.

Unlock Silver Trench:
Successfully clear Stormy Sea and Pitfall Valley. Befriend Articuno, Zapdos, and Moltres. Talk to Alakazam, and then go to the Birds' are and you'll get the Whirls

Unlock Wish Cave:
Successfully clear Pitfall Valley and have the friend area Blue Sky Meadow. Medicham and Ekans will show up. Talk to them. Ekans will only show later.

Unlock Fiery Field:
Give Xatu Spinda's Clear Feather

To unlock higher ranks get the corresponding amount of Rescue Points.

Unlock Bronze Rank:
Get 50 Rescue Points

Unlock Silver Rank:
Get 500 Rescue Points

Unlock Gold Rank:
Get 1500 Rescue Points

Unlock Platinum Rank:
Get 3000 Rescue Points

Unlock Diamond Rank:
Get 7500 Rescue Points

Unlock Rukario Rank:
Get 15000 Rescue Points