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Nightmare mode midgame fighting gym for a game with difficulty settings. Each Pokemon is its own puzzle that has to be solved in order to beat the gym. For instance, Breloom used a Spore, Substitute, Leech Seed, Focus Punch set with Poison heal and Toxic Orb. So despite being high powered, it's easily able to be beaten by any grass type that can bypass Substitutes. And Mienshao is so powerful that the only way to beat it is by getting it to kill itself by using protect/switching into a ghost type when it uses High Jump Kick and by racking up Life Orb recoil.