Just a reminder that providing specifics on, sharing links to, or naming websites where ROMs can be accessed is against the rules. If your post has any of this information it will be removed.
Ever thought it'd be cool to have your art, writing, or challenge runs featured on PokéCommunity? Click here for info - we'd love to spotlight your work!
Welcome to PokéCommunity! Register now and join one of the best fan communities on the 'net to talk Pokémon and more! We are not affiliated with The Pokémon Company or Nintendo.
In the script section PokemonCompiler, search for the phrase if value.length>10. Change the number.
It's unlikely this limit will ever be raised in Essentials, because many aspects of the GUI depend on the Pokémon species names never being longer than 10 characters. Letting them be longer would require changes to the GUI, and there are at least a few places where it is extremely difficult (if not impossible) to make it fit.