-1
if want reason for my "-1" :
if even winner and loser gets something
this will affect gold and silver's ecenomy very bad and as bhimoso said "this will cause inflation"
anyone wants inflation in game ? no
and ı didn't like the chalanges idea , for peoples have mono type / having a specific weather type team this will be so hard and they will be have to change their teams.
it means they can't no longer play with pokemons they want ; they have to change their teams with the pokemons they don't want in their team
and this will estrange them in pvp