Considering the game has changed a bit since the addition of new weaknesses, anything past first 8 robos didn't matter.
However, first 8 robos order went something like this for me:
Fuse -> Crypt -> Sunnyside...yeah, I forgot his name already -> Charade -> Toxic -> Pulse -> Circuit -> Shock
However, first 8 robos order went something like this for me:
Fuse -> Crypt -> Sunnyside...yeah, I forgot his name already -> Charade -> Toxic -> Pulse -> Circuit -> Shock