just got on legacy server alone, you only need a trap with 4 entrances and 2 doors, 2 ballista in the direction of the doors, do not get caught while you are feeding it because if you use the whip or hit it in any way it loses the percentage.

P.S. on Valguero use rare flowers to find it because it is in the forest to the right of the map and it usually does not fly, I saw it fly at tapejara height only with a dilophosaurus in its mouth so I think you must have a lot of luck finding it in the sky. good hunting