People have discovered the existence of Arcanine / Melmetal Cosmic Eclipse Checklane blisters. This product includes a Cosmos Foil Holo version of Arcanine or Melmetal from Unbroken Bonds. Growlithe and Meltan have no Cosmos Foil Holo treatment.
Also a TCGO code is included with each blister, which unlocks the Cosmos Foil Holo versions of Arcanine or Melmetal.
Target released these exclusive Checklane blisters before for the past Tag Team sets. We have had Umbreon or Espeon with Eevee during Unified Minds, Onix / Steelix or Wailmer / Wailord during Unbroken Bonds and Pikachu / Raichu or Magikarp / Gyarados during Team Up.
Much appreciated Mark for providing the information and the image!