From PokéHeroes Wiki
MissingNo. (Marowak) is a Glitch Pokémon released during the Halloween Event 2023.
The user had to collect 25.000 Halloween Candies to buy the Egg
|EHP:||EXP to level 100:|
|Egg group:||Mega Capable:|
MissingNo. (Marowak) does NOT evolve.