Risk it all and go directly at her

In the end Haunter decided to forgo any caution. If it lost it lost but it would saying didn't try. It madeits way over to the psychic gym where there seemed to be a commotion.

Moving the walls to get into the gym, the ghost found himself as a spectator to a fight. It seems Sabrina was busy battling another trainer. "What joy." The ghost frowned as he watched his brethren senseless fight for the sport of these humans.

The only downside it could see is that Sabrina seems to actually be pushing herself and her pokemon. This was good it made things easier for Haunter. A tired trainer was easy prey and if none of her pokemon were alright then it was even better.

Haunter watched in anticipation as the battle raged on. Sabrina had the advantage initially but this trainer fought back hard. They managed to get a footing when they ko'ed the Alkazam. From their it was downward spiral as Sabrina's other pokemon were quickly knocked down with each subsequent turn. Eventually she relented and then handed over the gym badge she owed to the trainer.

Once they said their goodbyes, Sabrina retire to her quarters while the rest of the gym and the trainers went elsewhere.

Hunter made his move. He didn't dare give her any more breeding room as he lunged forward forcing himself into her. "What the-" Sabrina was cut off as the pokemon fully entered her body.

The gym leader tried to resist to. Successfully keeping control of her body if only momentarily. She could feel the ghost trying to assert dominance in her weakened state. "You won't." Sabrina winced as she tried to keep focus.

Her body had stiffened as they fought for control. She had leaned against the wall catching herself just barely as to avoid falling down. She was tough, Haunter would give her that but he still had one more trick.

Using what strength he could wrestle from her, Hauntee managed to get control of upper arms. It wasn't much but it was enough because the next thing Sabrina knew she was pulling herself face first into a wall.

Thud!

The gym leader soon staggered from the impact, dazed before collapsing onto the ground. Now with her consciousness weakened Haunter was free to take over. Sabrina's body spammed and convulsed but eventually it stopped. Her eyes opened glowing red as the Leader...no Haunter stood up.

"Hehe...haha!" Haunter laughed with its new sexy voice. It looked down at itself at Sabrina's...no at its body. It had just claimed the body of the most powerful psychic in the land. Now it could have some fun.