Vanilla RE6 has a skill ceiling. The Ultimate Trainer removes that ceiling entirely. It is the definitive way to experience the game for the third or fourth time.
For new players: Beat the game legitimately once. The QTE (Quick Time Event) sequences and tense chases are designed for survival. Using a trainer on your first playthrough ruins the intended flow. Resident Evil 6 Ultimate Trainer
For a visual guide on how to install and use a trainer via Cheat Engine for Resident Evil 6, watch this demonstration: Vanilla RE6 has a skill ceiling