Currently, legend-specific rerolls (e.g., Lugia Rerolls/Darkrai/Shaymin Rerolls) become unusable if the player does not own that particular legendary Pokemon. This can make these rerolls feel wasted, when obtained through PvP Chests.
My Suggestion is to:
Introduce an NPC that allows players to exchange a legend-specific reroll for one of the following:
Another legend-specific reroll of the player’s choice, or
A fixed amount of PvP coins/tokens.
To keep the system fair and prevent abuse, the NPC could charge:
A small fee
Or limit exchanges to a certain number per day/week.
This change would keep rerolls rewarding.