Pokemon Ranger - The Road To Diamond and Pearl cheats and cheat codes for Nintendo DS

Password entry option :
Finish the game, then press L + R + A + X + Y + Left at the first Ranger Net 
screen. This will unlock a new password entry option under the 
"Play a special mission" option.

How can you catch a Pokemon:
You have to block the Pokemon from 3 sides. Stand in the 4th side of it. 
Then, throw a Pokeball to catch the Pokemon. Unfortunatelly you cannot keep 
it throughout the entire game. You must release your pokemon after about 10 
battles or it will run away. 

Transferring Manaphy:
Note: The following trick requires two DS systems and Pokemon Diamond or Pearl. 
Finish the Manaphy mission, then check the Egg in Ranger Net. The game will offer 
for you to start a wireless communication. Select it, then select the transferring 
option on Pokemon Diamond or Pearl. The egg will now be transferred from Pokemon 
Ranger to Diamond or Pearl. 

Catching Charizard:
You must make a circle slowly around him then fire when he goes to spit out fire. 
Do not continue. Just wait a few seconds and when he is done try again until 
you catch him.