Over the years, Pokemon Go has added a lot of different 'mons into the game. That's essentially the point - the game has drip-fed new Pokemon over the past six years, running through each generation as it experiments with different pacing for its rollouts. It has also had certain special reveals, tying Legendaries to Raids and Mythicals to Special Research, but also using events, festivals, or other one offs to introduce specific 'mons. However, it has occasionally been stumped by what to do, and it feels like Kecleon has been forgotten.
Kecleon is a Gen 3 Pokemon, a generation that (Kecleon aside) has been fully in the game since Jirachi’s arrival in summer 2019. Pokemon Go is currently up to Gen 7 and has a handful of Gen 8 (the most recent generation) 'mons already in our Dexes. This winter, Gen 9 will arrive with Scarlet & Violet, and it seems much more likely that we'll finish Gens 7, 8, and 9 before we do Gen 3 at this rate.
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Kecleon is a unique Pokemon. It's more interesting to think about than it is to actually use, because it can turn itself invisible at will. In the Hoenn games, Kecleon can be found in Fortree City where, much like Snorlax in Gen 1, its discovery is part of an in-game event. Most players remember this fondly, but few actually use Kecleon in their teams, which is why it's so odd that Pokemon Go has kept it under wraps for so long. We know Niantic is waiting to introduce the 'mon in an irregular way, and that it won't be a normal overworld encounter, but we're at the point where it's no longer worth it.
Kecleon has put Niantic in an impossible position. Nobody will really care when it arrives, meaning there's no way to drum up much hype for it.
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