As you've read the name this is about the best part of Pokemon. By 'part' I mean storywise e.g.
first part - start of game to 3rd gym
middle part - 3rd gym to 7th gym
last part - 7th gym to Postgame.
Don't just all say the last part cause that's when you get Lv100 and competitve battling talk about the actual gameplay, e.g. around the fifth gym because your still battling gym leaders which is fun but now most of your Pokemon are evolved and have better moves and now the Evil team is more involved.
Don't argue with each other as everyone is allowed their own opinion but please follow the rules, Enjoy.