A possible fanfiction could involve Tyranitar being a powerful protector in the Pokemon Reborn world and Rattata being an unexpected ally. Maybe Rattata has some unique ability that Tyranitar discovers during a battle against a common enemy, and they form an unbreakable bond as a result.
Ash would probably start with building a strong bond with Larvitar. He'd use his kind and patient nature, like he did with Pikachu. He'd feed it good Pokemon food, take it on adventures to gain experience, and train it in battles against weaker Pokemon first to build its confidence.
Their interaction could be quite interesting. Ash would likely be cautious at first because Tyranitar is a large and powerful Pokemon. But his kind nature would soon make him approach it gently. The female Tyranitar might be initially skeptical of Ash but then grow to trust him as he offers her food or helps her when she's injured. They could communicate through body language and Ash's understanding of Pokemon emotions.
One possible plot could be that Ash encounters a female Tyranitar in the wild. The Tyranitar is initially hostile but Ash manages to show kindness and understanding. They then form an unlikely friendship. Ash might help the Tyranitar when it's in trouble, like when it's facing a more powerful Pokemon. And together they might explore new areas and face various challenges in the Pokemon world.
There's a fanfiction called 'Ash and the Tyranitar's Destiny'. In it, Ash meets a Tyranitar that has a special power. They team up and face many challenges together. It's a great read for those who like action - packed adventures in the Pokemon world.
In a fanfiction, Tyranitar and Rattata might interact in a comical way. Rattata could be constantly trying to steal Tyranitar's food, and Tyranitar would be frustrated but also amused. This could lead to a series of adventures where they end up working together to find better food sources or protect their stash from other Pokemon.
One interesting fanfiction could be where Ash befriends a Tyranitar that has been abandoned by its trainer. Ash helps it regain its confidence and they go on to compete in battles together.
A possible storyline is that Ash discovers an injured Larvitar. He nurses it back to health, and as it grows, it has an unusual bond with Ash. When it evolves into Tyranitar, they become an unbeatable team. The story could also involve battles against other powerful trainers where Tyranitar's unique skills, which were developed through Ash's training, are put to the test.
I'm not sure if there is an 'M - rated' (which usually implies Mature content) fanfic specifically for Typhlosion and Tyranitar. Fanfic websites have a wide variety of works, but 'M - rated' content often violates the terms of service of many mainstream platforms. You could try looking on more niche or adult - oriented fanfic sites, but be aware of the potential inappropriate or unethical content that might be present.
Well, in a fanfic about Aggron and Tyranitar, you can expect a lot of action. Maybe they could be in a battle against some common enemy, like a powerful trainer who wants to capture them both. Their different strengths and abilities would play a huge role in the story. For example, Aggron's tough steel - type defenses and Tyranitar's brute force as a rock - type would make for some epic fight scenes.