That is a lie. Again, I know it's hard for you to be truthful, so NOT all Pentecostals believe that every believer will be healed. You're very ingenious to Pentacostals yet ignorant of them. Pentecostals teach that all believers can be healed, YET God is the one who heals. Healing is not permanent because the body is dying; we all will die a physical death. But we pray and ask Gd to have mercy, save, and heal. God says yet, no, and not yet. As for your false claim, the Bible is full of testimony of Jesus healing ALL. But there was one place he could do no miracles, why?
Matthew 13:58 And so he did only a few miracles there because of their unbelief.