A good competitive cocancer set

[Lord Windos]

I would rather see this Cocancer on a team completely built around the Sun support. I had a draft somewhere that put Archilles-M, Chlorophyll Coatlith and Water Absorb Blubelrog together as a core ; now I'm increasingly considering using Cocancer as a second Sun setter instead of Prankster Antarki. What do you think?

I would strongly recommend against that, mate. Having two Pokémon on your team with a 4X Weakness to Ice is just begging for trouble, and M-Archilles doesn't like taking a STAB neutral hit regardless. Prankster Antarki can set the Sun and spread Status/Taunt like a demented fiend, so I say stick with the ghostly pest. If you want Cocancer on your team, you are better off axing Coatlith instead, then adding either Tracton or Luxelong to your team for Dragon support. Luxelong can benefit from the sun with Moonlight and Flamethrower, so they synergize particularly well. N-Gellin with Chlorophyll would also work very well with a sun team, for obvious reasons.