Weakness Order

This page is something of a troll, but it is true. 
 Neptune > Mars > Venus > Jupiter > Saturn > Mercury > Pluto > Uranus > Terra > Neptune 
 Bolded robots are in the second half of the game. As such, it is true you cannot use only weakness order. 
 Other Weaknesses 
 Dark Moon: Mars 
 Enker: Buster Only 
 Quint: Mars 
 Punk: Neptune 
 Ballade: Mars & Venus 
 Fists: Neptune 
 Wily Phase 2: Terra 
 Sunstar takes 1 point of damage from all attacks (Jupiter lasts long enough to hit twice)