I think the anime could not represent Pokemon recharging also not everything in the games are represented perfectly in the anime like charizard learning tackle for example we see a good example of that in the kalos anime when team rocket try to control a salamence it uses Hyper beam consecutively without recharging. Also most Pokemon represented there are seen as ferocious, dangerous,Extremely OP and recharging would make them look more under control and would not help the action .
hope I helped