JP Magus 43 -- Slash 4th Ozzie switch

(end 1st phase)

(wait for Geyser)
  Lightning + Robo MT Crono
  mash Lightning
  delay Frog CRIT until Robo ATB (crit 232 not 66)
  Robo CRIT
  mash Lightning

(cast a Spell)
  Frog CRIT 
  Lightning + Rocketpunch slowish 
    (Robo might get turn first [he's on Item] - also ensure Frog gets turn next, not Crono again)
  Frog CRIT
  Crono attack
  mash Rocketpunch
  Crono Xstrike

(Darkmatter)    [2 Punch + CFCFC]:
  Rocketpunch
  Crono attack
  Frog CRIT
  Crono attack
  Rocketpunch
  Frog CRIT
  Crono attack (after spell is fine)

(cast a Spell) 
  Crono Xstrike
  Rocketpunch
  Crono Xstrike
  Rocketpunch
(GG)

note: if 2nd Darkmatter, ur good