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It's best set is easily sub, focus energy, air slash, and hydro. iirc it can 2hko pex with sniper hydro pump, but it definitely does with rain. It's easy to force out with faster pokemon, but the secret to inteleon is that it isn't actually a cleaner or sweeper, but a breaker, despite what it's stat spread might tell you. the other route to help it punch through that one annoying defensive core against your team is screens, to more consistently get off the focus energy. Again, you have to just accept that it's easy to force out with faster mons.