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.
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.
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.
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.
He might interact with Pokemon based on his animal forms. For instance, if he transforms into a bird, he could fly with flying - type Pokemon and learn their flight patterns. This would help him in battles as he could strategize better. He could also communicate with Pokemon that are similar to the animals he can transform into, using his understanding of their natural behaviors.
Viola's bug - type Pokemon and Grant's rock - type Pokemon might initially be a bit cautious around each other. For example, Viola's Surskit might be a bit intimidated by Grant's Tyrunt at first. But as they get used to each other, they could start to play. The Surskit could skate around the Tyrunt, and the Tyrunt might be curious about this little bug - like 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.
The Pokemon could befriend the ponies. For instance, a friendly Bulbasaur might help the ponies in their gardens by using its grass - type abilities. The ponies, in return, could offer the Pokemon shelter and food. They could also learn from each other. Ponies could teach Pokemon about their culture, like the different pony tribes and their traditions, and Pokemon could show ponies their unique battle strategies.