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Metronome using Swinging Sphene

Hi, During a game earlier, I used my Clefable's Metronome ability and chose Swinging Sphene from my opponent's Alolan Exeggutor ex. The coin flip was a heads. But for some reason this didn't knock my opponent's pokémon out. Considering it was in the active spot, I don't fully understand whether this is a bug or a strange ruling.

I will enclose the battle log in case anyone wants clarification.

Any help is gratefully appreciated!

Setup
bad_luck69 chose tails for the opening coin flip.
Chessermon won the coin toss.
Chessermon decided to go first.
bad_luck69 drew 7 cards for the opening hand.

  • 7 drawn cards.
    Chessermon drew 7 cards for the opening hand.
  • 7 drawn cards.
    • Nest Ball, Revavroom, Buddy-Buddy Poffin, Switch, Arven, Arven, Mewtwo ex
    bad_luck69 played Exeggcute to the Active Spot.
    bad_luck69 played Snorunt to the Bench.
    Chessermon played Mewtwo ex to the Active Spot.

Turn # 1 - Chessermon's Turn
Chessermon drew Super Rod.
Chessermon played Nest Ball.

  • Chessermon drew Varoom and played it to the Bench.
  • Chessermon shuffled their deck.
    Chessermon played Buddy-Buddy Poffin.
  • Chessermon drew 2 cards and played them to the Bench.
    • Clefairy, Clefairy
  • Chessermon shuffled their deck.
    Chessermon played Switch.
  • Chessermon's Clefairy was switched with Chessermon's Mewtwo ex to become the Active Pokémon.
    Chessermon's Clefairy is now in the Active Spot.
    Chessermon's Clefairy used Moon-Watching Party.
  • Chessermon attached Basic Psychic Energy to Clefairy on the Bench.
  • Chessermon shuffled their deck.
    Chessermon ended their turn.

Turn # 1 - bad_luck69's Turn
bad_luck69 drew a card.
bad_luck69 played Horsea to the Bench.
bad_luck69 attached Basic Grass Energy to Exeggcute in the Active Spot.
bad_luck69 played Calamitous Snowy Mountain to the Stadium spot.
bad_luck69's Exeggcute used Precocious Evolution.

  • bad_luck69 evolved Exeggcute to Alolan Exeggutor ex in the Active Spot.
  • bad_luck69 shuffled their deck.

Turn # 2 - Chessermon's Turn
Chessermon drew Buddy-Buddy Poffin.
Chessermon played Buddy-Buddy Poffin.

  • Chessermon drew 2 cards and played them to the Bench.
    • Clefairy, Marill
  • Chessermon shuffled their deck.
    Chessermon's Clefairy used Moon-Watching Party.
  • Chessermon attached Basic Psychic Energy to Clefairy on the Bench.
  • Chessermon attached Basic Psychic Energy to Clefairy on the Bench.
  • Chessermon shuffled their deck.
    Chessermon evolved Varoom to Revavroom on the Bench.
    Chessermon played Arven.
  • Chessermon drew 2 cards.
    • Ultra Ball, Hero's Cape
  • Chessermon shuffled their deck.
    Chessermon played Ultra Ball.
  • Chessermon discarded 2 cards.
    • Super Rod, Arven
  • Chessermon drew Clefable.
  • Chessermon shuffled their deck.
    Chessermon evolved Clefairy to Clefable on the Bench.
    Chessermon attached Hero's Cape to Clefable on the Bench.
    Chessermon ended their turn.

Turn # 2 - bad_luck69's Turn
bad_luck69 drew a card.
bad_luck69 attached Basic Water Energy to Alolan Exeggutor ex in the Active Spot.
bad_luck69 evolved Snorunt to Froslass ex on the Bench.
bad_luck69's Alolan Exeggutor ex used Tropical Frenzy on Chessermon’s Clefairy for 150 damage.

  • bad_luck69 attached Basic Water Energy to Froslass ex on the Bench.
    Chessermon's Clefairy was Knocked Out!
    Chessermon's Clefable is now in the Active Spot.
    bad_luck69 took a Prize card.
    A card was added to bad_luck69's hand.

Turn # 3 - Chessermon's Turn
Chessermon drew Buddy-Buddy Poffin.
Chessermon played Buddy-Buddy Poffin.

  • Chessermon drew Varoom and played it to the Bench.
  • Chessermon shuffled their deck.
    Chessermon's Clefable used Metronome.
  • Chessermon chose Swinging Sphene
  • Chessermon flipped a coin and it landed on heads.

Turn # 3 - bad_luck69's Turn
bad_luck69 drew a card.
bad_luck69's Alolan Exeggutor ex used Tropical Frenzy on Chessermon’s Clefable for 150 damage.

Turn # 4 - Chessermon's Turn
Chessermon drew Switch Cart.
Chessermon's Clefable used Metronome.

  • Chessermon chose Swinging Sphene
  • Chessermon flipped a coin and it landed on tails.
    bad_luck69's Horsea was Knocked Out!
    Chessermon took a Prize card.
    Tulip was added to Chessermon's hand.

Turn # 4 - bad_luck69's Turn
bad_luck69 drew a card.
bad_luck69's Alolan Exeggutor ex used Tropical Frenzy on Chessermon’s Clefable for 150 damage.
Chessermon's Clefable was Knocked Out!

  • 4 cards were discarded from Chessermon's Clefable.
    • Basic Psychic Energy, Basic Psychic Energy, Clefairy, Hero's Cape
    Chessermon's Clefairy is now in the Active Spot.
    bad_luck69 took a Prize card.
    A card was added to bad_luck69's hand.

Turn # 5 - Chessermon's Turn
Chessermon drew Basic Psychic Energy.
Chessermon played Tulip.

  • Chessermon moved Chessermon's 2 cards to their hand.
    • Clefable, Basic Psychic Energy
    Chessermon attached Basic Psychic Energy to Clefairy in the Active Spot.
    Calamitous Snowy Mountain was activated.
  • Chessermon put 2 damage counters on bad_luck69's Clefairy.
    Chessermon evolved Clefairy to Clefable in the Active Spot.
    Chessermon's Revavroom used Rumbling Engine.
  • Chessermon discarded Basic Psychic Energy.
  • Chessermon drew 5 cards.
    • Buddy-Buddy Poffin, Basic Psychic Energy, Professor's Research, Switch Cart, Basic Psychic Energy
    Chessermon's Clefable used Metronome.
  • Chessermon chose Swinging Sphene
  • Chessermon flipped a coin and it landed on tails.

Turn # 5 - bad_luck69's Turn
bad_luck69 drew a card.
bad_luck69 attached Basic Water Energy to Froslass ex on the Bench.
bad_luck69's Alolan Exeggutor ex used Tropical Frenzy on Chessermon’s Clefable for 150 damage.
Chessermon's Clefable was Knocked Out!

  • 3 cards were discarded from Chessermon's Clefable.
    • Basic Psychic Energy, Basic Psychic Energy, Clefairy
    You conceded. bad_luck69 wins.