Possible Archaludon ex bug TCG Live

Rechluse

Archaludon ex's attack reads:

During your opponent’s next turn, this Pokémon has no Weakness.

Is it safe to assume that the effect only works on the specific pokemon that used the attack? I ask because in my previous match I switched my opponents Archaludon for a Diagla using Boss's Orders and the Diagla also had no weakness.

Is this a bug? Or am I misunderstanding the effect?

Pokémon342548

Did your opponent have a Dragon-typed Dialga? It has no weakness by itself.

Rechluse

Nope, but fair question. It was a Diagla V. So metal type.

Pokémon342548

Did your opponent also have the Pokémon below in play? If they did, check its Ability:

Rechluse

Nope. Only the Dialgal V and the Archaludon ex. Maybe there was an arena in play with the same effect? Could have been what i missed.

Pokémon342548

Did that Dialga V evolve into V-Star? If not, did it have the following card attached to it?

Rechluse

This was likely it. I must have missed them.
Thanks for taking the time to puzzle it out with me.

Pokémon342548

https://community.pokemon.com/en-us/discussion/comment/62419#Comment_62419

No problem! Next time, I (and others) can help you if you post the battle log.