I think it has something to do with befriending PuPu to get the PuPu card which you refine into a Hungry Cookpot which can be refined further into the Rosetta Stone.

So...

Cephalopod's delight - What PuPu wants
Although an All button -
Would speed things up - would speed things up
To warm Ptomely's heart - to get the Rosetta Stone

And to befriend PuPu you need to give him an elixir so my answer is Elixir!