The second part of the Halloween Mischief event has started. This one is Ghoulish Pals. Several of the Pokémon from the first week still have increased spawns in the wild, but some of them are replaced. Niantic has a great overview of these over at https://pokemongolive.com/post/halloween-2021/?hl=en#part-2
With this second part of the event, we have some new Pokémon Debuts. The Ghost-, and Grass-type Pokémon Phantump, Trevenant, Pumpkaboo and Gourgeist. These were first discovered in the Kalos region in the games Pokémon X and Pokémon Y.
Pumpkaboo and Gourgeist are the first Pokémon in any game to have a size difference that can actually be visible seen in the games. Pokémon did already have different sizes, no visual difference. In Pokémon GO we also have different sizes. Depending on a Pokémon' size it might have an "XS" or "XL" if it differs much from the average. With the additional of these Pokémon, there is now "XXL" too for Super Size Pumpkaboo and Gourgeist.
This means that with their release, the first Pokémon with a visual size difference are now also in Pokémon GO. Here you can see a screenshot of a Super Size Pumpkaboo in the wild near me and the silhouettes from nearby PokéStops also show them in different sizes.
The Super Size one was my first Pumpkaboo I caught, which also shows in its Pokédex registry. Here are my Pokédex entries for Pumpkaboo and Phantump.
As seen before with the different silhouettes, that means these count as different ones in the Pokédex. So here's a look at Pumpkaboo's Pokédex entry. It shows the Small, Average, Large and Super Sizes. This will be the same for Gourgeist.
Everywhere in the game these size differences can be seen. Here are my first two wild encounters, for the Small Size and Super Size Pumpkaboo as seen in the above Pokédex Entry. In the same photo I have all 4 different sizes of Pumpkaboo next to each other.
There is also a Pumpkaboo Collection Challenge where you have to catch Pumpkaboo of all 4 sizes if you want to complete it. It will reward you with 5 Rare Candy. Here's the screenshots of that and when I completed it.
Have you caught some different sized Pumpkaboo?