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Usually you only pressure stall against stuff like Clefable and T-Tar that carry Fire Blast to beat Ferro. It makes your own Ferro's job easier when you can take that out of the equation.
You can of course PP stall stuff like Tox if your team has issues dealing with it, but typically you're...
Issue with Phantom Force is that even if Jelli/Corsola decide to stay in, they'll just hit you with a strength sap after you hit them and get all their health back, leaving you at -1