After I search for the Play Store and I find this one, it is just like a Pokemon encyclopedia. If I want to take over a gym, it will list all the pokemon which are most likely to win and also the wise skills that can make great attacks. Just go check more details below.
https://play.google.com/store/apps/details?id=com.attack.poke
https://play.google.com/store/apps/details?id=com.attack.poke