[Bug Report] # Mimikyu (GRI 58). Glaceon-GX (UPR 39). They

Mimikyu (GRI 58). Glaceon-GX (UPR 39). They used frost bullet.
I used marshadow Gx (with guzma) to KO a slugma on bench with copycat
except it said frost bullet wasn’t a valid attack

Game starting
Game type: QUICKPLAY
Game format: Standard
Player A: AngryBokoblin
Player B: TheAquaPiplup
Coin flip result: HEADS
Player A will start.
Game setup complete
Between turns. TC: 1
Player A drew 1 card
Player A played Mysterious Treasure.
Psychic Energy (SM 168) was discarded
Put [Inkay (FLI 50)] to Hand
A has shuffled deck.
Put Inkay onto bench
Player A played Ultra Ball.
Guzma (BUS 115) was discarded
Giratina (LOT 97) was discarded
Put Jirachi (TEU 99) to hand
A has shuffled deck.
Put Jirachi onto bench
Player A played Cynthia.
Put 1 card to Deck
A has shuffled deck.
Player A drew 6 card
Player A played Pokémon Communication.
Put [Dawn Wings Necrozma-GX (SMP 101)] to deck
Got [Inkay (FLI 50)] from deck
A has shuffled deck.
Put Inkay onto bench
Attached a Psychic Energy to Marshadow-GX.
Psychic Energy (SM 168) was discarded
Marshadow-GX retreated.
Jirachi is now active
Jirachi has used Stellar Wish
Put [Lillie (UPR 125)] to Hand
A has shuffled deck.
Jirachi is now asleep
Asleep coin flip result: HEADS
Jirachi is no longer asleep
Between turns. TC: 2
Player B drew 1 card
[TheAquaPiplup]: time to big brain
[AngryBokoblin]: is that possible?
Player B played Ultra Ball.
Judge (LOT 209) was discarded
Switch (SM 160) was discarded
Put Eevee (SM 101) to hand
B has shuffled deck.
[TheAquaPiplup]: maby
Put Eevee onto bench
Player B played Escape Rope.
Inkay is now active
Eevee is now active
Player B played Ultra Ball.
Double Colorless Energy (GRI 166) was discarded
Guzma (BUS 143) was discarded
Put Tapu Lele-GX (GRI 137) to hand
B has shuffled deck.
Tapu Lele-GX has used Wonder Tag
Put [Lillie (UPR 151)] to Hand
B has shuffled deck.
Put Tapu Lele-GX onto bench
Player B played Lillie.
Player B drew 8 card
Attached a Water Energy to Eevee.
Eevee has used Energy Evolution
[AngryBokoblin]: worked good
Eevee evolved into Glaceon-GX
B has shuffled deck.
[TheAquaPiplup]: Of course I draw all 3 remaining eevees
Put Eevee onto bench
[AngryBokoblin]: lol
Marshadow-GX’s ability is blocked.
Between turns. TC: 3
Player A drew 1 card
Player A played Pokémon Communication.
Put [Inkay (FLI 50)] to deck
Got [Malamar (FLI 51)] from deck
A has shuffled deck.
Inkay evolved into Malamar
Giratina (LOT 97) used Distortion Door
Giratina was put on bench
Slugma got 10 damage
Eevee got 10 damage
Attached a Psychic Energy to Giratina.
Player A played Lillie.
Player A drew 5 card
Player A played Nest Ball.
Inkay was put on bench
A has shuffled deck.
Malamar has used Psychic Recharge
Attached a Psychic Energy to Giratina.
Between turns. TC: 4
Player B drew 1 card
Attached a Double Colorless Energy to Glaceon-GX.
[AngryBokoblin]: kill me I dare you
[AngryBokoblin]: the inkay is staring into your soul
[TheAquaPiplup]: the inky will be shot
Glaceon-GX used Frost Bullet
Glaceon-GX did 90 damage to Inkay
Glaceon-GX did 30 damage to Marshadow-GX
Inkay was knocked out
Player B took one prize card.
Jirachi is now active
Between turns. TC: 5
Player A drew 1 card
Player A played Mysterious Treasure.
Mimikyu (GRI 58) was discarded
Put [Malamar (FLI 51)] to Hand
A has shuffled deck.
Inkay evolved into Malamar
Jirachi has used Stellar Wish
Put [Cynthia (UPR 119)] to Hand
A has shuffled deck.
Jirachi is now asleep
Attached a Psychic Energy to Marshadow-GX.
[TheAquaPiplup]: gosme
[AngryBokoblin]: ?
[TheAquaPiplup]: Guzzma
[AngryBokoblin]: thinking of what I want
Malamar has used Psychic Recharge
Attached a Psychic Energy to Marshadow-GX.
Player A played Guzma.
Slugma is now active
Marshadow-GX is now active
Jirachi is no longer asleep
Jirachi is no longer asleep
[AngryBokoblin]: why can’t I copycat?
[TheAquaPiplup]: What
[AngryBokoblin]: u used frost bullet right
[TheAquaPiplup]: Ye
[AngryBokoblin]: with mimikyu in discard
[AngryBokoblin]: it says
[TheAquaPiplup]: I kno
[TheAquaPiplup]: Report as bug maybe
[AngryBokoblin]: opp didn’t use a valid move last turn
[AngryBokoblin]: like what?
[AngryBokoblin]: I dunno what to do here then
AngryBokoblin is out of turn time. Asking TheAquaPiplup to extend turn time…
TheAquaPiplup confirmed extra 1 minute of turn time.
Marshadow-GX used Filch
Player A drew 2 card
Between turns. TC: 6
Player B drew 1 card
[TheAquaPiplup]: I think that it says that if GX attack
[TheAquaPiplup]: You ruined my plans
[AngryBokoblin]: you didn’t gx tho
[TheAquaPiplup]: I kno
[AngryBokoblin]: so confused
Choice Band is attached to Glaceon-GX
Attached a Double Colorless Energy to Slugma.
Double Colorless Energy (GRI 166) was discarded
Slugma retreated.
Glaceon-GX is now active
Marshadow-GX’s ability is blocked.
[TheAquaPiplup]: sad
Viridian Forest is now in play.
Used Viridian Forest effect
Eevee (SM 101) was discarded
B has shuffled deck.
Player B played Lillie.
Player B drew 3 card
Player B played Ultra Ball.
Eevee (SM 101) was discarded
Viridian Forest (TEU 156) was discarded
Put Magcargo (CLS 24) to hand
B has shuffled deck.
Slugma evolved into Magcargo
Magcargo has used Smooth Over
Glaceon-GX used Frost Bullet
Choice Band +30
Glaceon-GX did 120 damage to Marshadow-GX
Glaceon-GX did 30 damage to Giratina
Marshadow-GX was knocked out
Psychic Energy (SM 168) was discarded
Psychic Energy (SM 168) was discarded
Player B took one prize card.
Player B took one prize card.
Jirachi is now active
Between turns. TC: 7
Player A drew 1 card

@developers

I think the problem is that the developers think mimikyu cannot use any attacks from GXs.
Mimikyu can only not use GX attacks.
You know the once-per-game attacks.
Please fix soon because it’s a simple change and detrimental to game play.