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It really depends on your team composition. Leech Seed is pretty much a must-have, Encore/Switcheroo is good for hurting your opponent's momentum and allowing you to set up, Memento is great for building up your own momentum as well, and finally, Tailwind/Stun Spore is great for supporting your team.
If you don't want to be total taunt bait, it's best to replace one of the moveslots with U-Turn or Moonblast, the former being better for momentum, the latter being better for damage.
