Move Reminders

Hey, so I caught a Delta Pikachu to help we with my fight against Jaern, but it doesn’t know Moonblast, and after looking for the Move Reminder, but I never found it. I even looked for them in the Wiki and all I could find were Move Tutors. Are the Tutors a replacement for the Reminders or are they somewhere that I haven’t found yet?

they are buyable in the secret base, you use heart scales for relearning moves.