Niantic Labs highlighted a series of changes headed to XL Candies this March in the hopes of making them more accessible to trainers in Pokemon GO.
XL Candies were introduced around the start of 2021 as Niantic decided to raise the trainer level cap from 40 to 50. In order to subsequently boost their Pokemon, trainers would have to rely on a new type of power-up called "XL Candy." They are the equivalent of 100 regular candies and were known to be a rare commodity.
Pokemon GO XL Candy Updates
In a post on their update blog in late February 2021, Niantic set forth a few changes they would be making to the mechanics behind XL Candies in the following month of March. The company has seen fit to highlight them again on its official Twitter page, likely indicating that the full set is now live for all trainers.
According to Niantic, trading a Pokemon "will have a chance of rewarding a Candy XL for the Pokémon you’ve traded" that increases the further away two trainers are. This is likely to compensate for the loss of Stardust needed for the trade—especially with high-powered Pokemon.
They have additionally increased the chance of discovering XL Candies while a trainer is walking with their Buddy Pokemon.
Finally, all captures of "Legendary, Mythical, or evolved Pokémon" are completely guaranteed to reward XL Candy upon success.
The candies will, of course, directly correspond to the Pokemon in question. Trading a Scizor will result in XL Scizor/Scyther Candy, walking with an Absol will reward XL Absol Candy, catching Mew will give trainers XL Mew Candy, and so on.