Poison Seeds stick to a Pokemon, slowly absorbing it's power until it cannot use any moves except normal-type moves. Fairiby are unaffected by this. In fact, by using Poison Rocket, Fairiby can attach Poison Seeds to a Pokemon. If a Fairiby does give a Pokemon Poison Seeds, they can later take the Poison Seed off the Pokemon and attach it to themselves. By doing this, Fairiby can use all the moves that the Poison Seed absorbed. Fairiby only do this if they have to or if their trainer orders them to. Fairiby do not enjoy giving a pokemon Poison Seeds.