make her change into something?

Ash pulled out his Rotom phone and showed a picture of Misty to Delia.

"Do you have similar clothes?"

Delia nodded. "I'll go change."

Ash hypnotized Mimey and Pikachu to think everything that went on in the house was normal. Wouldn't want them getting alarmed at the new Delia. After a while, Delia returned. The yellow shirt Misty usually wore was tight on Delia, showing decent cleavage, and the overalls were unable to stay fastened, causing her shorts to show a generous amount of ass.

Ash's mouth widened. Delia saw this and smiled.

"I take it you like my outfit then?"she giggled.

Ash nodded.