Question

Mine knows:

Bug Buzz: Good power, high accuracy, chance to lower Sp. Def, STAB.

Giga Drain: Decent power, higher PP than in previous generations, high accuracy, heals Beautifly, used to deal with Rock types.

Attract: Causes infatuation.

Toxic: Inflicts toxic poison.

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Comments

Beautifly (M) @ Focus Sash
Trait: Swarm
EVs: 252 SAtk / 4 SDef / 252 Spd
Timid Nature (+Spd, -Atk)
- Bug Buzz
- Butterfly Dance
- Hidden Power [Flying]
- Giga Drain

Answer 1

Toxic is worthless on Beautifly. With low defense, toxic wont have a chance at defeating the opponet. I always found that for Beautifly, Giga Drain(damage and healing), Bug Buzz(strong STAB), Shadow Ball(covers some types), and Psychic(almost as good as earthquake) worked excellently.

Answer 2

Beautifly (M) @ Life Orb

Trait: Swarm

EVs: 4 Def / 252 SAtk / 252 Spe

Modest Nature (+SpA, -Atk)

• Quiver Dance
• Bug Buzz
• Psychic
• Giga Drain/Hidden Power Fighting

Quiver Dance is setup to manage it to do some damage.
Bug Buzz is good STAB.
Psychic hits Fighting types and Poisons.
Giga Drain hits Waters and Rocks and is some healing, but Hidden Power Fighting can be used to hit Steel- and Rock-types.
Modest nature and Life Orb is for maximum damage output.

Answer 3

Gen V

Beautifly (M) @ Focus Sash
Trait: Swarm
EVs: 252 SAtk / 4 SDef / 252 Spd
Timid Nature (+Spd, -Atk)
- Giga Drain
- Quiver Dance
- Bug Buzz
- Shadow Ball