Unable to edit certain text within Ultra Moon

[Apall-Low]

I've been working on an Ultra Moon Rom hack for a while now, and one of the things I've edited is in-game trades. Upon testing, I realized that the 'You received____' text remains the same even when changing the pokemon you receive. For example, I changed the Aerodactyl trade for a Cherrim, and it still says "You received Aerodactyl!" I figured I could simply edit the text, but it's nowhere to be found in both the story and game text editor tools. If anyone knows where I can locate and edit this specific line of text, please let me know.