so when i was farming pokemon exp in magikarp battle...i opened clan rewards in another tab...so when i did a battle wih 23+k level golurk..i did only one battle..it gave like 500k clan credits...my real question is that if i have more high level pokemon will i earn more clan credits?
i need clan credits alot

Yes as your pokemons level gets higher the more clan credits you get per match

B M when you have a high level pokemon in your party the xp gained will also increase . The xp gained with a 100level pokemon is bigger than xp gained from level 10 pokemon .

Train in dark alleys mysterious man (go to your town , click dark alley amd battle against the mew ) , this battling system gives you the most xp . Thus you get more clan credits

Iirc, clan credits depend not on your pokemon level bu the level of the pokemon you beat. And from what I remember, it's capped at 400k credits i.e. maximum credits you can earn per pokemon defeated is 400k and the cap is close to level 2000. Again, I'm not sure about that if it was changed in some update, but you can always check.