Hi can you please recover the original abilities of my 2 weezing?
 they was levitate.
you can check i bought them and after a while and i figure it out their abilities have changed today and that literaly affect me in game battles.

Hello there @Michaelx, Thank you for reaching out and sorry for the inconvenience this may have caused.

Unfortunately, we cannot recover the original abilities of these pokemon, here is the reason why:
Before the Generation XIII, Koffing and Weezing had 2 abilities, Levitate and Stench (Hidden Ability).

We recently updated to the Generation IX mechanics, which means that Koffing and Weezing got their 3rd Ability - Neutralizing Gass.
Once it got added, 50% of all Koffing's and Weezing's that had Levitate got the new ability, and the other 50% were left with Levitate.

The ability was pre-determined from the second these pokemon were caught, but Neutralizing Gass wasn't in the games code, giving them all Levitate.

On the other hand, Neutralizing Gass is a very strong ability and also preferred for PvP in most cases, which raises the objective value of your pokemon. It's coded and works as intended.
I sincerely apologize for this, as this may not be the outcome you had hoped to get, but I personally believe this could possibly be a lucky inconvenience for you.
I really hope that you are going to find a way to optimally use the new abilities mechanics and enjoy your impressive catches even more then before!

If you have any more questions regarding this topic, let me know.
Best regards, Thaloras.

well i paid very expensive pokemoney for this 2 pokes (2m+ for each) bcs of their ability levitate and their stats that fit in my team. and today when i need to use them with levitate i cant bcs they will die with any eart atk. this is unfair. literaly both pokes got the nature i didnt ask for it. im very harmed bcs of this change. you guys shall atlast allow the players to choice if they whant to keep or change the weezing ability. not just random change them and say sorry if they get screwed up.. im not the only one harmed bcs of this, i asked in brazil community and many players stop playing bcs of this kind of arbitrary decisions. im very desapointed. now i just lost 2 pokes that i like and need to use in pvp/boss. bcs of this change. 

I understand how you feel about it, and again, I apologize for that inconvenience, but I can't do anything about it.
As I already said, the ability was pre-determined upon catching them, long time before Neutralizing Gas was added to the game.
There was no way that anyone could have known if any of them would keep Levitate or turn into Neutralizing Gas.
This situation has a lot of similarities to the Iron Barbs Ferroseed. In that case, you couldn't know if the Ferrothorn would have Hidden Ability or keep the Iron Barbs untill it got evolved.

In your case the new mechanics made your pokemon to change Ability, not the evolution, but they have the same concept.

Also, worth mentioning, neutralizing all opposing pokemon abilities can be really useful in boss fights also.

I hope this information helps.