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In the context of Pokémon games, an experience multiplier directly influences how much XP a Pokémon receives after a battle. The base experience points are determined by the defeated Pokémon's base experience yield, and then adjusted based on factors like the battle's difficulty level (which can be influenced by the opponent's and your team's levels). A multiplier of x2 essentially doubles the amount of XP your Pokémon receive.
Assuming the current value at a specific offset (let's say, 0x05E9C ) is:
