For some reason, Niantic added a feature to Pokémon Go, where sometimes Pokémon can be HUGE and sometimes they’re tiny. It feels like a relatively useless feature that doesn’t really change the gameplay at all, but I mean, sure, I’ll get a little Poochyena, please and thank you!
Launching now, Pokémon Poochyena, Mightyena, and Mawile can appear in XXS or XXL sizes. Why only those three Pokémon? I don’t know, ask Professor Willow. In fact, it’s probably to create that sense of excitement they can draw as they slowly roll out, uh, little Pikachu and big Eevee. Or, when they appear in the game, the Pokémon is far from the camera and the Pokémon is near the camera.
We’ve had Pokémon sizes since the game first launched in 2016 — usually, this size is used for those horrible Reddit jokes in which people nickname their Pokémon. according to certain body parts, then take a screen shot of the assessment, where the Professor will say, “Your [body part] is huge! if the Pokémon is larger in size. Do you understand what I mean. You can’t nickname Pokémon in that language anymore, but as a consolation, there’s now a feature in the Pokédex that shows you the size range of the Pokémon you’ve caught. When you catch a new smallest or largest Pokémon for each species in your Pokédex, you’ll get a fun little pop-up congratulating you.
You will know if you come across a super big or super small guy in the wild because their sizes will be different. And there will be few animations to tell you this. Personally I think these animations are a bit like the animations that appear when you find a shiny Pokémon in the wild, and a large Mawile is simply not as exciting as a shiny one, but hey, I Not game design. If I did, I would have a shiny Mawile.