Editing Ash Ketchum/Relationships (section)

===[[Gengar]]:===
Ash first met Gengar at the Cerise Laboratory where it was causing trouble. Although Chloe chased it away, Ash ended up being stalked by Gengar later on as it was still in the area. Hearing that it was abandoned by its original Trainer, similar to the way his Charizard, his Infernape, and his Pignite was abandoned by Damian, Paul, and Shamus when they were a Charmander, Chimchar, and Tepig, Ash offered Gengar his friendship and it became official when he saved it from Team Rocket.

After passing out from a fever Ash unknowingly caught and recovered when he woke up, he noticed an apple and a Poké Ball by his bedside. Seeing this, Ash realized that Gengar wanted to go with him and accepted it to his team along with it becoming his second Pokémon he caught in his journey around the world. Ash and Gengar are very good friends with each other, although he once accused it for something it didn't do but didn't assume that again when it attacked him for that.

During their trip to Stow-on-Side in Galar, Ash learned about Gengar's Gigantamax form from the Gym Leader, Allister. After a failed first attempt at the Stow-on-Side Stadium, Allister assisted Ash, Goh, and Gengar into finding three clusters of Max Mushrooms in order to make Max Soup for it drink and help Gengar become eligible to Gigantamax. The following day, after Gengar drank the Max Soup, Ash managed to successfully activate Gengar's Gigantamax form.