About Energy In GYM BATTLE

When I use a pokemon to attack defender, my pokemon can increase energy.
When defender attack me, my pokemon is still increase energy.
How much energy increase ? And Where can I see the guide about this

When I use a pokemon to attack defender, my pokemon can increase energy.
When defender attack me, my pokemon is still increase energy.
How much energy increase ? And Where can I see the guide about this

When I use a pokemon to attack defender, my pokemon can increase energy.
When defender attack me, my pokemon is still increase energy.
How much energy increase ? And Where can I see the guide about this