Is Peter Lynch still relevant in 2025? In this One Up on Wall Street review, I distill his six stock categories and PEG‑driven GARP into a modern, trader‑friendly checklist: alt‑data scuttlebutt, earnings‑quality screens, and risk‑first position sizing. I show how to hunt potential tenbaggers while avoiding value traps, when to trade around a core long, and how to separate AI narratives from real cash‑flow growth.