The Kilaaks, realizing their mistakes in 1999 when they tried to take over the world, have come back to try again. Their plan is simple, take over the big cities and progress to smaller ones, like the aliens in "Independence Day". The Kilaaks have developed a method to control the Kaiju that is impossible to break. They took over Honshū, Hokkaidō, Kyūshū and Shikoku and are using them as headquarters. They have fortified their base so that it is impossible to attack them with normal weaponry. Only monsters can attack the base. They have the following Kaiju and Mechas under their control.
King Ghidorah [Showa]
SpaceGodzilla [Flying Form]
Grand King Ghidorah
Now it is your job to command Earth's army's to stop them, you can take control of monsters with the use of Francium. It only takes 4 atoms of Francium to control a monster, but there is only 20 atoms on Earth. Francium provides a unbreakable mind control over its subjects. So you can control five monsters to send to war to take the Kilaaks down.
RULES: No Mechas, there is no fuel left to power them. Any monster can transform to any other form of it. And you must provide and attack plan
I would pick the following monsters to go to war with
Burning Godzilla Heisei
Attack Plan: Send in Burning Godzilla alone to melt down and severely weaken their defenses. Then send in Gamera and Armor Mothra to flank a charge by GFW Godzilla and Biollante