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.
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The Universal Pokémon Randomiser has this option. I often use the UPR to add things into ROM hacks even if I don't randomise them, such as running indoors, lower case Pokémon names and the aforementioned level increase.
Ahh. I don't know then. I thought the UPR could do it without randomising (like how it can de-capitalise Pokémon names and allow Running Shoes indoors without randomising).