Quick answer: how do you beat Nosferatu in Code Veronica?
To beat Nosferatu in Resident Evil Code Veronica, enter the arena with a reliable supply of sniper rifle ammunition, keep a clear line of sight, and wait for the exposed heart instead of firing into the wings or body. The fight becomes much safer when you treat distance and movement as the main defense rather than trying to trade damage up close.
Nosferatu is also a resource check. Before the cutscene, heal, make room for the next pickup, and keep a separate save if your route allows it. If poison gas reaches you, do not keep standing in the same pocket to finish one more shot: move to clean space, check your status, and recover before returning to the firing lane.
This page covers the classic Code: Veronica X encounter only. It does not claim that the same arena, weapon balance, poison behavior, or boss weakness will carry into the Resident Evil Veronica remake. Use the official Capcom and Steam links below for remake context, while using the guide sections for the original game.