Hi! if i buy membership and catch donate pokemon, i can use this pokemon when i lost membership?

yes

Hi! if i buy membership and catch donate pokemon, i can use this pokemon when i lost membership?

Hi hitropl,

 

Of course, once you have caught them, you will be able to use them even when you do not have membership activated anymore.

Membership is activated on one's account via usage of a Membership Medallion. It can be obtained through the Coin Shop. Alternatively, the item can also be traded from players. These are the following benefits:

• 50% experience-gain bonus.
  
• 100% (2x) increase to the money-yield rate.
  
• Access to a multitude of content-oriented perks—namely membership-exclusive Pokémon spawns and areas.
  
• More info about these areas and Pokemon can be found here or on the PROWiki
  

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I hope you understand and feel free to ask if you have more questions about it.