First of all, you shouldn't pay attention to braggers. They may have beaten you, but nobody likes a bragger. Second, although they may be useful at times, status attacks aren't worth keeping. My team only know attack-attacks, and I beat pretty much anything. Teach all your Pokemon non-status moves, and you're well on your way to beating these braggers. Third, level your Pokemon up a bunch of times and you'll have a good upper hand. Fourth, looks like you've battled them enough times to know their main team. With that information, you can form a powerful team with type advantages. And lastly, if your so called friends keep bragging, just say something witty, like 'You win, you lose, it doesn't really matter'