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#1. Switching should be dangerous and costly. Entry hazards make the latter happen.
#2. It's 50% damage to smogonbird, which is a good thing to have dead.
#3. It breaks Multiscale.
#4. It helps keep the genie trio from being too powerful.
#5. Charizard.
#6. It doesn't deal much damage to awesome pokémon like Breloom.
#7. If you like Stall, it can shut something down a turn earlier than Toxic or Leech Seed could alone.
#8. It isn't too powerful, because Defog and Rapid Spin exist.
#9. It also reks Smogonbeetle and the rare Volcarona.
#10. It's one of two reasons why nobody runs Delibird.