Godzilla - Domination! - Platform: Gameboy Advance

Defeating Mecha-King Ghidora:
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Use King Ghidora. As soon as the match starts and it roars three times 
(one for each head), jump and press B (multi kick). After Mecha-King 
Ghidora freezes, attack the light on its chest the same way. When 
Mecha-King Ghidora attacks you, do not dodge (just block) unless it 
jumps. Once it finishes, repeat the steps above until you destroy 
each head. Note: Try not to use special attacks -- they are not very 
useful.

Float:
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As Mothra, Rodan, or King Ghidorah, hold R to jump and float down more 
slowly. Note: This works especially well on the Moonbase level.

King Ghidorah: Keep Air Kicking:
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Play as King Ghidorah and jump by pressing R. Hold R then press B to 
kick. If you keep holding R and tapping B, you will stay floating and 
kicking.

Monster Island from Godzilla: Destroy All Monsters Melee:
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Play as Godzilla or Mothra in story mode. Complete all eight levels 
to see the ending sequence. When you complete all eight stages, the 
background will resemble the Monster Island level from Godzilla: 
Destroy All Monsters Melee on the Gamecube.