Growlithe could be a very loyal addition to Ash's team. It might have a more protective nature compared to some of Ash's other Pokemon. This could change the way Ash approaches battles. Instead of always going on the offensive, he might rely on Growlithe to defend the team first. Also, the other Pokemon on the team might look up to Growlithe's courage, which could inspire them to be braver in battles.
Well, one possible plot could be that Ash finds a Growlithe that is injured in the wild. He decides to take care of it and train it. As they train together, they form a strong bond and face various challenges in the Pokemon world, like battles against Team Rocket who are after Growlithe for some devious plan.
I'm not really into lemon fanfictions as they often involve inappropriate content. However, you can try searching on some well - known fanfiction platforms like Archive of Our Own. Just be sure to check the tags and ratings to avoid any unsavory material.
Ash could be shown as more empathetic towards Growlithe. His usual determination to be a great trainer could be combined with a newfound protectiveness over Growlithe. For Growlithe, it could be developed as being more curious about Ash's world and trying to adapt to human ways while still maintaining its Pokémon instincts.
Well, I don't really recommend writing lemon fanfictions as they often cross the line of propriety. But if you must, focus on the emotional connection between Ash and Growlithe first. Build up their relationship in a deep and meaningful way before any sort of 'lemon' elements are introduced. And make sure to use euphemisms and not be overly explicit.
One idea could be that Ash discovers a special Growlithe with unique powers. As they spend time together, a deep bond forms that goes beyond the normal trainer - Pokémon relationship. This could lead to them facing challenges side by side and their relationship evolving in a way that's different from the usual Pokémon adventures.
One great 'Ash starts with Eevee' fanfiction is 'Eevee's Adventure with Ash'. It shows Eevee evolving in unique ways under Ash's guidance. Another one could be 'Ash and Eevee: A New Bond' which focuses on their initial meeting and how they form a strong connection that helps them in battles.
You can try fanfiction platforms like Archive of Our Own (AO3). It has a vast collection of Pokémon fanfictions, and chances are you'll find some that involve Ash starting with Litten there. Just use the search function on the site.
Social media groups dedicated to Pokémon fanfiction can also be a great place to look. For example, on Facebook or Reddit, there are groups where fans post their works or recommend good fanfictions. So, search for relevant groups and look for the 'Ash starts with Greninja' fanfictions there.
In this fanfiction, Ash could develop better strategic thinking. Froakie's abilities would force Ash to come up with new battle plans. He'd study Froakie's moves and how they can be combined in different ways, thus enhancing his strategic skills. He may also become more empathetic towards Froakie as he discovers more about its nature and feelings, leading to a more well - rounded character.