TheGameSite: Gameboy: Power Mission
SUPER STRONG FLEET
Choose your fleet formation and end your turn. Do not carry out any battle plans. While the enemy fleet is moving, press and hold Left, Select and B. When it is your turn to move, your fleet will be fully built up.
This will allow you to power up your fleet to 99 Hit Points at any point in the game. It also gives you unlimited movement unless the vessel is in shallow water. This enables you to surround and destroy the enemy flagship in 2 turns.