The OOC Post: Each trainer will make an OOC post that includes participants (character and user), terms, and agreed-upon rewards of the battle. The terms include anything the participants agreed upon, including the number of Pokemon eligible for use from both sides and the posting speed you wish to set, if needed. Here is an example of an opening post:
John Doe v.s. Jane Doe
Users: [@nobody01] & [@nobody02]
Terms: Three Pokemon from either trainer, no items
Prize: 4 Pokeballs to the winner, prepaid by both trainers (2 Pokeballs each, 10CP per trainer)