Malphite is a powerful counter-pick against AD champions; aim for him as a late pick if enemy AP counters (Sylas, Mordekaiser, etc.) are absent.
Prioritize defensive tank items like Iceborn Gauntlet and Thornmail, as they synergize best with his kit, and generally avoid full AP builds for more reliable team contribution.
Leverage his easy-to-play kit with strong teamfight ultimate engages and consistent lane poke with Q to maintain pressure and scale effectively.