So as you all know swarming pokémon tend become much rarer once the swarm is over meaning we need data of all the swarming pokémon we've had as the locations given doing a swarm are not always accurate. Cresselia Darkrai Shaymin Heatran Regigigas Terrakion Verizion Cobalion Keldeo These all need more accurate location data since their swarms have ended. Location where you caught one doing the swarm do not count for this as said before they become rarer once their swarm ends.