Earth Elementum

Wanna to know how to defeat Earth Elementum? Look at this...

http://www.worldofmiscrits.com/elementums-earth.html

This is Earth Elementum. 
This Elementum often uses this few skills:  

1. Gem Strike(A massively powerful Earth attack)
2. Sink hole(An absurdly powerful Earth attack that rarely hits.) 25% (Attack Power:1000)
3. Sacred Stones(Raises Elemental Defense by 13)
4. Rock Smash(A massively powerful physical attack)

Strategy: Lower defenses until cannot lower anymore then 1 hit K.O.