>>41272201-You must fight every Pokémon you meet, no run away option. Capturing them or not is your decision, though.
-All the trainers you can fight in the game will get progressively stronger every time you are defeated by one trainer. They receive a stat boost to all their Pokémon every time that happens.
-If your Pokémon team has a higher level, then the level of the opponent Pokémon will be scaled to match yours.
-The Number of Pokémon you can bring to battles is limited by the number of badges you have. You can only bring two Pokémon to a battle after obtain two badges, for example.
-You cannot bring a Pokémon strong against the type of a Gym, unless they are your starter.
-Pokémon defeated by a trainer cannot be used again against that trainer, unless they evolve.
-Pokémon defeated in a Gym cannot be used again against that Gym, even if they evolve. Same applies to the Elite Four and Champion fights.
-Against the Elite Four members and the Champion: Items of any kind, like Potions to heal HP, can only be used outside of the fights.
-If you lose the final fight in the game, then your save is deleted and you have to start all over again.