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This move always deals 40 HP damage. Dragon Rage isn't affected by STAB, weakness, resistance, or any other factors.
The only Dragon-type move in RBY. One would expect greatness, but it's very, very lackluster. Unlike Seismic Toss and Night Shade, which can hit for up to 100 damage, Dragon Rage does a fixed 40 damage per use, therefore is not viable competitively.
Night Shade is a Ghost-type variant that always deals an amount of damage equal to the user's level
Seismic Toss is a Fighting-type variant that always deals an amount of damage equal to the user's level.