I think what the OP is trying to get across is that level-scaling for duels should be implemented as an option, not the ability to permenantly un-level your Pokémon. I do agree that as an option it would be nice to be able to choose to have a duel at level 50, that way players with Pokémon that are all at max level can be scaled down - for the duration of the duel only - to fight against their newer friends. I think something similar is there in the Stadium or Colosseum games, I don't quite remember.