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Nintendo DS - Dragon Quest Heroes: Rocket Slime cheats

Unlock Knightro Slime tank in Challenge mode
Go inside the church and press Y, L, L, Y, R, R, Y, Up, Down, Select 

Unlock the Nemesis Slime in Challenge mode
Go inside the church and press Y, R, R, Up, L, L, Y, Down, Down, Down, Y, Select

Unlock Schwarzen in Tank Masters mode:
Beat the last Boss. Then, go to where you beat Slival on Mt. Krakatroda. 
Beat Slival again to unlock the Schwarzen. 

Unlock Gott Schliemen in Tank Masters mode:
Beat the last Boss and save all 100 Slimes. Then, beat Hooly and the Shogun in 
the final round of Tank Masters mode. 

Unlock Giggles in Tank Masters mode:
Finish the game once. Then, speak with "Meggan", the green Egg Slime in 
the northwest building of the central part of town.