Well, Ash is a very kind - hearted person. So when it comes to a female Articuno in a fanfiction, he would likely offer her shelter if she needed it. He might also introduce her to his other Pokémon friends. They could all play together, and Ash would be excited to see how the female Articuno interacts with his Pokémon, sharing in their joys and maybe even helping them out when they face difficulties.
One possible plot could be that Ash discovers a female Articuno that is injured. He decides to help it heal. During the healing process, they form a special bond. The female Articuno then decides to accompany Ash on his journey for a while, using its ice powers to help Ash in battles against tough opponents.
Friendship is a common theme. Ash often forms a strong bond with Articuno in these stories, which helps them face various challenges.
Ash would probably be very curious about the Avengers' powers. He might ask a lot of questions and want to see them in action. In return, he could show them his Pokémon and how they fight.
They would probably be a bit shy at first. Ash being his usual energetic self but also respectful of Serena's space in the tent. Serena might be a bit nervous but also excited to be sharing such a close space with Ash.
In 'Ash Catches Articuno Fanfiction', one frequent theme is the exploration of the Pokémon world. Ash might discover new places while on his quest for Articuno. Also, the theme of perseverance is quite common. Ash has to keep trying despite the difficulties in catching such a rare Pokémon. Additionally, the bond between Ash and his Pokémon is often emphasized as they work together towards this goal.
There's a 'ash articuno fanfiction' titled 'Articuno's Choice'. In this story, Articuno chooses Ash as its trainer in a rather unorthodox way. Ash has to prove himself worthy to the other Pokémon in the area. It's an exciting read with a lot of character development for Ash.
Ash's determination and never - give - up attitude would inspire Cynthia in new ways. Meanwhile, Cynthia's poised and collected nature would have a grounding effect on Ash. They would learn from each other's strengths. For example, Ash could teach Cynthia about the importance of having fun during the journey, while Cynthia could show Ash how to be more patient and think things through.
Ash is very adventurous and has a strong sense of justice. Rukia is also brave and has her own moral code. Their personalities would likely mesh well as they both strive to do what's right. Ash might be a bit more impulsive, while Rukia is more calculated. So, Rukia could help rein in Ash's impulsiveness at times, and Ash could encourage Rukia to be more spontaneous.
Ash, being the enthusiastic and determined trainer he is, would likely approach Roxie with great respect for her as a gym leader. He would probably be eager to learn from her about different Pokemon types and battle strategies. Roxie, on the other hand, might be initially a bit reserved but would gradually warm up to Ash's energy.
One major problem is that it violates the family - friendly nature of the Pokémon series. Pokémon is aimed at a wide audience including children, and lemon fanfiction involves sexual or inappropriate content which is not suitable for this fanbase.