All battles both wild and trainer must be avoided unless mandatory to either the story or getting a HM Slave required to progress.
Items are not allowed to be used in battle such as hyper potions or X items, but held items such as berries are allowed.
Trading over pokemon, TMs or items are not allowed, and can trading can only be done in order to evolve a pokemon.
Should we faint to a trainer, then the game must be turned off so we don't gain exp from failing the battle.
Only one species of the same pokemon is allowed on the team.