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If you wanna be free of all this darkness, you gotta defeat a Hypno. This one's Dark/Psychic, so the AI was probably thinking it'd be safe to send in vs Espeon. Hypnosis just doesn't do jack shit vs Espeon or Umbreon... wait that means the whole plan was stupid in the first place. Sing works perfectly fine though, so No Guard just hurts it more than anything
I'm guessing this symbolizes breaking the Hypno's hold over you. It would've been better to just kill it before it got its hold on you in the frist place but whatever, better late than never.