The mainline Resident Evil titles released on PlayStation 2, in chronological order:
Story Order Recommendation: 0 → Remake (1) → 2 (not on PS2 natively, play via PS1 BC or ports) → 3 (same) → Code: Veronica X → 4. The PS2 is the best original hardware for 0, Remake, and CVX. For RE4, the recent Remake (2023) or PC/PS4/Xbox/Switch ports of original are superior to the PS2 version.