Haematoxopoiesis is a Blood-typed status-afflicting move.
Its name is an allusion to Haematopoiesis, the creation of blood cells by bone marrow. Haematoxopoiesis alters the process remotely and triggers a single burst of toxin production instead, poisoning the victim instantly. Due to the volume of affected blood, it's a particularly vicious degree of poisoned state, and a pokémon affected by this will take a greater hit to health each turn than a normal poisoned status would mandate, but does not count as badly poisoned, i.e. the damage does not increase each turn. Instead, it steals 1/6th of a pokémon's health each turn.
Its accuracy is affected in normal ways; immobilising the victim does not give it an accuracy of 100%, though of course then it can simply be repeated until it does afflict said victim.