What are "Game Mechanics"?
Game Mechanics are hidden calculations, tools and extras in the game that make it run, make each Pokémon unique, and determine your ingame luck. Without them, Pokémon just wouldnt be fun!
In a battle scene, the Pokémon at the top of the screen is the opponent´s the Pokémon at the bottom is the player´s. At the beginning of each turn, players are given the option to fight, switch Pokémon (Pokémon), use an item (Bag), or run from battle (Run, however it´s not an option in trainer battles).
Battles between Pokémon are the central game mechanic of the Pokémon RPG series. They are used to train Pokémon to become stronger, as competition and to reach certain objectives within the game. Battling can also be done between human players via a link cable or wireless technology.
Pokémon uses a turnbased system. When the player challenges a trainer or encounters a wild Pokémon, the screen changes to a battle scene with the opposing Pokémon, their respective HP bars, and an option menu. At any time, the player may carry up to six Pokémon in his active party the top Pokémon in the lineup is automatically sent into battle. Both sides can attack , use an item , switch the Pokémon for another, or flee from battle (the last not an option in battles against other trainers). At the start of a turn, both sides choose an option if both sides attack, the one who goes first is determined by Speed , although some moves, items, and effects can override this. If either side chooses any other option, that action is performed before the attacks.
Each Pokémon uses moves to reduce the respective opponent´s HP (a measure of health) to zero, at which point the Pokémon faints. If the player´s Pokémon wins, it receives experience points when enough have accumulated, the Pokémon´s level increases. If the player´s Pokémon faints, he may use another Pokémon or flee if the player has no usable Pokémon left in his party (i.e., if they have all fainted), he loses the battle, returns to the last Pokémon Center he visited, and loses half of his money.
Pokémon Ruby and Sapphire introduced double battles, in which the opposing teams battle with two Pokémon at a time. Though the basic mechanics remain the same, moves may have multiple targets some affect the ally as well as the opponents. Additionally, some abilities work only in double battles. The third generation games only included double battles against other trainers, but Diamond and Pearl introduced double battles with wild Pokémon.
Pokémon Black & White introduced Triple Battles. The customary function of Triple Battles are where each trainer has to send out three Pokémon from their roster out on the field at once.
In Triple Battles, positioning is a huge factor. Depending on how you place your Pokémon, be it left or right, they can only attack two of the opponents Pokémon, instead of all three. The Pokémon on the far right can not attack the Pokémon on the far left and the Pokémon on the far left can not attack the Pokémon on the far right but you are able to switch the position of a Pokémon for a cost of a turn. While on the other hand, the Pokémon placed in the middle can attack all three of the opponents Pokémon without rotating but that makes it vunerable to the opponents Pokémon. In addition to that, the Pokémon positioned in the middle will cause more damage to all of the opponents Pokémon by using an attack that targets all Pokémon. (ie: Surf, Earthquake)