|The user attacks opposing Pokémon with explosive fury. The lower the user's HP, the lower the move's power.|
Eruption does damage proportionately based on the user's HP. This move's base power reduces as the user's HP reduces and is calculated by the formula:
However, its power cannot be less than 1. Consequently, its power varies between 1 and 150.
In a Double Battle, Eruption will hit both opponents. In a Triple Battle, Eruption will only hit opposing adjacent Pokémon.