i was thinking about this a while ago, but never bothered to make a thread for it. a gold plort would turn it into a largo, but jump twice as high and/or fast. if you manage to find and catch it before it likely falls into the slime sea, you can take it home with you. you can then feed it and get some coins like a normal one, but every time it would launch up and break the air net in one shot. it'd bounce back down to give the air net a chance to recharge, but consider it gone if you accidentally feed it more than once without letting it fully recharge again. if you feed it a gilded ginger (rumored to be the gold slime's favorite) it'll give off 2 gold plorts, but be so happy it jumps and pierces through the air net, into the sky, and disappears like a normal lucky/gold slime.
If you want a Gordo as big as possible before starting to tremble, feed it 23 of its favorite; 32 for Pink! Thanks to @NoticeMeGenki for assisted research!
*I make a note to only post original ideas that I haven't seen others suggest.