Pet trading is where users of this virtual pet game can trade their pets for other player's pets. Each trade can have up to 5 pets on them, and each pet offer can have 5 pets on them. Currency Trading is not allowed - you can only trade pets for other pets. If you only want to send a pet to another player, you should use the Pet Exchange because this is for trading pets for other pets.
Trading Fee - the trading fee is how much the trade will cost. This MP is a fee for completing the trade safely, and is not given to the owner of the pet you are trading with. The cost per pet is the same as the Pet Exchange.