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The Big Root (Japanese: おおきなねっこBig Root) is a type of held item introduced in Generation IV.
If a Pokémon holding a Big Root uses a draining move or Strength Sap, it restores 30% more HP than it otherwise would. Additionally, a Pokémon holding a Big Root regains 30% more HP from Leech Seed, Ingrain and Aqua Ring. In Generation V onwards, the factor is 5324/4096.
The Big Root also increases the damage taken by the holder from Liquid Ooze.