Pokémon Go’s Halloween Event is intended to celebrate ghost-type Pokémon and the start of Gen 3, but it appears there’s been a glitch in the matrix. Recent developments at the Silph Road subreddit suggest water biomes have become overrun with the region-exclusive monster called Corsola.

As a regional, water-type Pokémon, Corsola generally spawn between 31 degrees north latitude and 26 degrees south latitude. While this means the monster’s habitat technically spreads across continents, it’s typically only found in the most tropical of climates. However, these days trainers might be able to locate one near any large body of water. Several users have claimed that areas typically filled with a variety of water-type Pokémon are now filled with Corsala.

Given that this occasion doesn’t jive at all with the ghostly theme of the ongoing Halloween Event, it’s assumed this phenomenon may, in fact, be some sort of mistake. Over the weekend, Pokémon Go’s developers at Niantic tweaked Pokémon spawns to ensure more ghosts spawn in watery places. Shortly after that tweak went live, however, the Corsala invasion was made known. In other words, if you’re looking for a Corsala and live near an ocean or lake, now might be the right time to go hunting. Especially if this trend is accidental, we don’t expect it to last long.

As those following Pokémon Go’s Halloween Event closely will know, the occasion is set to take place now through Nov. 2. In addition to increasing spawn rates for all existing ghost-type Pokémon, five new ghosts from Gen 3 have also been introduced to the game. With more ghosts popping up everywhere, it’s the best time to snag Sableye, Shuppet, Banette, Duskull or Dusclops before their true rarity settings take effect. This is basically the soft launch of Gen 3 Pokémon with the full roster due sometime in December.

Before that day comes, however, Halloween Event players can also take advantage of double candy rewards, double Buddy Pokémon finds and, of course, the infamous witch-hat Pikachu that’s been commonly spawning from low-tier eggs. Let it be known that if you’re getting lots of Corsala candy it won’t do you any good. Corsala has no evolution, so its candy doesn’t have much use. Regardless, the fact that this monster is out in full force will be greatly appreciated by trainers who refuse to travel too far for the sake of a game. Coast trainers assemble, because now is your time to strike!

Pokémon Go is available now on iOS and Android devices.

How do you feel about Pokémon Go’s Halloween Event so far? Were you able to find a Corsola? Tell us in the comments section!