Hell's Rider fights alone, a trait he shares with his three palette swap counterparts: Dante, Test Rider, and Death Rider. The Hell's Rider uses normal attacks, Venomist to inflict Poison on the party, and its special attack, Silver Lance, a strong physical blow. It counters attacks with Reverse Polarity, shifting the attacker's row. Locke can steal a valuable Mythril Vest from it, but the Rider will counter with Silver Lance.
The best way to deal with it is to have Gau use the MuRage and hope Snare is used, or use the Commander Rage and hope it uses Break, killing the Hell's Rider instantly. Another method is to have Cyan use Tiger on it to halve its HP and give it Sap.
The Rider is one of the few non-randomly encountered enemies to appear on the Veldt and have a Rage.