Win any match in battle mode then replay the same match without
changing any other options (except for the stage, if desired). You
will play as Golden Bomber during the replay.
Complete the game in normal mode once to unlock the "Group A/B"
option at the stage selection screen in battle mode. Press Up or
Down to toggle between Group A and Group B. Group A gives you
access to the basic power-ups during standard battle mode matches,
while Group B gives you access to the more advanced power-ups.
Note: The traps of most of the stages change when you select Group B.
This trick works for any battle game mode. Immediately before the
battle game starts, when "Ready" appears, use the C-stick to
change the angle of the field. You cannot do this after the game starts.
You need the Light Bomb and Water Bomb. When the Boss is not
solid, throw a Light Bomb at it. If you throw a Light Bomb at one
of the bomb elements when it is not solid, it will not damage the
boss. Use a large Water Bomb and throw it at the ring of fire that
surrounds the Boss. Then, use a large Water Bomb to attack him. He
will remain solid after he is surrounded by the fire.
Use the following trick to defeat the three-headed bird in Area
5-4. Instead of using Light, Fire, Wind, or Ice Bombs, use large
Water Bombs, since fire is weak against water. His attacks are
slow so they are easily avoidable. After you defeat him, you will
receive a Purple Bomb element.