Leech Seed. 10,922 pages on this wiki. Leech Seed (やどりぎのタネ Mistletoe Seed) is a Grass-type attack that attaches a parasitic seed to the opponent's Pokemon. Pokémon at the end of each, turn it will Take Hit points from the opponent until the opponent is, defeated, swapped or has ran, away even if the user faints or switches. out