Undefeated Pokémon in gym battles

I was in my dads car for about 30 minutes just trying to win a valor gym and I battled Blissy for more than half of the time I was at that gym battle. I think that the next update should make powerful Pokémon be defeated in gym battles when players but those type of Pokémon in a gym battle. I wasted so many health boost potions and revives to get all my knocked out Pokémon to be as good as new. Also you should be able to fight your own team in gym battles like the last update.Blissy is the most powerful Pokémon I ever faced and I get so close to defeating it but then the timer runs out. Another thing is that the timers should but from 120 seconds to 150 seconds. The time you have to fight a boss at a gym is very low and needs to be higher.

Splatoon is cool about Pokémon GO, v1.37.2