I am a new Player Playting PRO , Today I opened the Game , I am In Jhoto , just defeated first Gym , suddenly I see only 1 of my pokemon is getting XP , I am used to automatic Experience share to all my pokemon after I fight , What happened ? did i switch off something ?

Shared XP is only in some events, usually only your Pokemon from the fight receives the experience (or another Pokemon if it has Exp. Share)

Hello @Technorookie,

 

Welcome to PRO! 

 

The Party Exp Share is a server wide bonus that usually reserved for our large community events. The way it works is that it gives Exp and EV to all unfainted Pokemon in your party. This makes is great for training several Pokemon at once. However, now that the Summer Event is over, it has been removed. It will most likely return during the upcoming Halloween Event, our next big community event. 

 

In addition to the Party Exp Share, you can also obtain the item Exp. Share.  When held by a Pokémon in your party, that Pokémon will earn the Exp and EVs without having to fight. As mentioned in the link though, you can only get one of these items. 

 

I hope you are enjoying the game!