Pearl Jam
Pearl Jam is a Stand power featured in Part IV: Diamond is Unbreakable. Its user is Tonio Trussardi and it is named after the US rock band, Pearl Jam. [1]
About
Pearl Jam is a multi-body stand (at least three bodies; almost certainly far more), each body looking something like a cross between a head of garlic and a pearl onion with arms and a face. The bodies are extremely tiny, as they need to be ingested to do anything. First, Tonio examines his customer's hands to see what ailments he/she suffers (apparently a granted power of Pearl Jam, though similar practices exist in Chinese traditional medicine). From this, he knows what foods to prepare. The meal is served one course at a time, with Pearl Jam's bodies inside. Once inside the "patient"'s body, Pearl Jam invokes a sense that whatever is being eaten is extremely delicious (even if the consumer dislikes the general taste, such as Okuyasu's aversion to spicy foods) to make sure that the food is continuously eaten. It then uses the incoming raw material to repair and replace damaged and diseased tissue, forcibly ejecting anything that falls under "replace", even opening up one's belly for a short while to eject replaced intestine. Unlike most other stands that Josuke meets, Pearl Jam was not awakened by an Arrow, but by Tonio's zeal to perfect his culinary arts.