Some examples, but chose somewhat compatible five of your own to make it the most fun or interesting :
Godzilla v Zok ( Flying Space Dragon.
Kong v Igoo (Lava-Rock Ape
Anguirus v Tundro ( Multi-pedal-extending, armored, rhinocer-ratops hybrid, burrows through rock with explosive energy-cannon-horn.
Hedorah v Gloop (protoplasmic stretching shapeshifter , can strangle, smother, able to absorb and deflect energy blasts and laser beams.
Mothra (Larva) v Gleep (protoplasmic stretching shapeshifter , can strangle, smother, able to absorb and deflect energy blasts and laser beams.