Snitches Get Stitches is the fourth stage in Coup de Chat.
Kid Tappa continues to spawn every 16.7 seconds500f, up to 5 can be seen in this stage.
Catellite and Titans (and Cats in the Cradle, if possible) are the way to go, the only other thing you need is the Breakerblast cannon or any other way to break barriers. Use all first 5 slots for combos (mainly speed), as you don't need much variety in your cats.
With full CotC treasures, Le'Solar has a mere 40,000 HP and around 4,000 Damage, so just stall using Catellite and Manic Mohawk until Bahamut is ready, then as long as Henry, Hackey or Croakley don't hit Bahamut, he'll solo the stage and win.