No need to argue. Please, if you are concerned about the rules of a challenge, PM the owner POLITELY or report it/send me a message. I checked and there is indication that the owner of this challenge is playing Black 2. Also, what happens in the game outside of your control is always priority over challenge rules, so things like Never Entering the Pokemon Center are ignored if the game forces you. He shouldn't have to include an exception for every scenario, it's common sense. Thank you and have a nice day.