Dragon Quest Heroes: Rocket Slime
This game is titled Dragon Quest Heroes: Rocket Slime in North America and Europe, and Slime MoriMori: Dragon Quest 2 - Daisensha to Shippo Dan in Japan.
The Nemesis Slime tank in Challenge mode
Press Y, R(2), U, L(2), Y, Down(3), Y, Select inside the church.
Knightro Slime tank in Challenge mode
Press Y, L(2), Y, R(2),
Y, Up, Down, Select in side the church.
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Giggles in Tank Masters mode
Successfully complete the game. Then, talk to "Meggan", the green Egg Slime in the northwest building of the central part of town.
Gott Schliemen in Tank Masters mode
Defeat the final Boss and rescue all 100 Slimes. Then, defeat Hooly and the Shogun in the last round of Tank Masters mode.
Schwarzen in Tank Masters mode
Defeat the final Boss. Then, go to where you defeated Slival on Mt. Krakatroda. Defeat Slival again to unlock the Schwarzen.
Defeating Don Clawleone
First, get your own tank's HP to 0. This may seem counter-productive, but making your own tank die makes winning a lot faster. Once you have killed your own tank, Don Clawleone will try to infiltrate your tank to get to the engine. He has only two attacks, both of which take time to do, so you can kill him easily. One releases a ring of fire that moves too quickly to dodge. The other makes a shockwave of energy that also moves fast but in only one direction. Once you have killed him, the tank will say that this does not change anything, but it actually does. Until he is resurrected, his tank will not shoot anything, leaving plenty of time for you and Slival to fire rapidly. Once his tank dies, rush towards it and Slival will follow. Do not worry about Don Clawleone destroying your tank, as he teleports to you and tries to kill you. Pay no attention to him, as Slival will try to kill him and break the energy rods in your way. He is good at this, because he can break many at once. Once you reach the engine, which resembles a Kaffrizzle item, Slival will try to destroy it, but cannot. You will still have to do it. After that, the tank will explode like any other tank and you will win. He also has drill-like items that prevent you from using your cannons and Kaffrizzles, which release a group of fireballs that can hurt you.
Do not just shoot at your enemy to protect yourself against his bullets. Shoot yourself to their cannon room and stop them from attacking. This allows your teammates to attack while you are killing the enemy inside their tank.
Do an Elasto Blast into a slime or former member of the Plob in the town. They will jump around a lot. If you talk to them once they start jumping less high, they will say something different than what they usually say. Note: This will prevent you from using things like Tank Masters and using Splodgy Dave's store until the corresponding person recovers after a few seconds. Also, you can only do this to the Wyrtle (the dragon/turtle thing with the huge shell) if you do the king of Elasto Blast where you start flashing.
Strategy guides from GameFAQs