Meltan & Melmetal
Meltan and Melmetal are Mythical Steel-type Pokemon first introduced in Pokemon GO. Following a vote in KEP's Discord server, Meltan and Melmetal were added to the Showdown Mod as part of an update that added Pokemon from Scarlet and Violet. When porting them to this ROM Hack, I decided to get creative with their implementation, ensuring that they are added as faithfully as possible. The primary inspiration was taken from Pokemon GO, with Let's Go Pikachu and Let's Go Eevee (LGPE) also kept in mind, given they are the main reason this was even considered!
Meltan is obtained in KEP by opening the Mystery Box, which can be found in the Safari Zone, much like how Meltan is obtained in the GO Park in LGPE. On use, the Mystery Box will replace all wild encounters with Meltan until the player leaves the location. The Mystery Box is not consumed on use and can be used at any time. Meltan has a catch rate of 3 - the same as the Metagross line in modern games - so they're not very easy to catch! Bring lots of Ultra Balls!
Using the Mystery Box in an area with no wild encounters will not spawn a Meltan, as, well, there are no wild encounters to trigger...
When defeating a Meltan, the player will obtain 10 Meltan Candies, of which one needs 400 to evolve a Meltan into Melmetal. Thus, defeating 40 Meltan is enough. These candies are stored in the new Candy Jar item, naming derived from LGPE. The Candy Jar can be obtained at the Indigo Plateau.
The Candy Jar, initially, functions like the Coin Case, displaying the player's total candies at that point in time. Once the jar reaches 400, however, it instead functions as an evolution stone, evolving a Meltan into Melmetal. Upon evolving Melmetal, however, the candies in the jar are consumed instead of the jar itself, reverting it to its Coin Case-like state.
Not many main series Pokemon enthusiasts have played GO, so I will explain how it works in that game as well.
Meltan is obtained in GO by opening the Mystery Box, a gift given to players for connecting their account with Pokemon Home or LGPE. When opened, Meltan appears among other regular encounters for an hour, usually giving you around 30 in the process. Capturing them gives you 3 Meltan Candies, of which you need 400 to obtain Melmetal. Releasing Meltan gives you 1 each. You could say Meltan's uniqueness amongst Mythical Pokemon is in its abundance. Meltan is imported to the main series by sending Meltan to the GO Park, the game's replacement for the Safari Zone.