I'm Not Like Normal Guys:
A Guide to offensive Normal STAB
- ||What are we working with?||
Belly Drum: Normal -- Maximizes Attack but halves HP
Shell Smash: Normal -- +2 Attack/Special Attack/Speed, -1 Defense/Special Defense
Swords Dance: Normal -- +2 Attack
How do you choose over the other?
-Belly Drum is preferred if you can disable a foe (Sleep), cause a switch (Intimidate), or aren't too worried about Speed (Chlorophyll/Sand Rush). Of course ExtremeSpeed remedies the issue of Speed unless you're facing a faster Normal-type or Pokémon that also carries ExtremeSpeed.
-Shell Smash is preferred if you want to preserve HP, need +2 Speed, don't mind carrying a White Herb (Huge Power Azumarill), or can attack on the Special side (Meloetta/Espeon/Jolteon).
-Swords Dance is preferred if you don't need Speed (too Slow or can rely on ExtremeSpeed), don't want to lower defenses with Shell Smash and carry White Herb, or can't afford to be at half HP after a Belly Drum.
A lot of Pokémon can work effectively with all 3, however, and will take on different roles depending on your team needs.
Belly Drum
Chlorophyll / Sap Sipper /
Serene Grace 80/100/70/60/70/95 - Access to: Spore, ExtremeSpeed, Horn Leech, Leaf Blade, Power Whip, Nature Power, Jump Kick
Early Bird / Scrappy /
Inner Focus 105/95/80/40/80/90 - Access to: Lovely Kiss, ExtremeSpeed, Drain Punch, Sucker Punch, Explosion
Intimidate / Sand Rush /
Scrappy 85/100/90/45/90/80 - Access to: ExtremeSpeed, Crunch, Nature Power, Superpower, Explosion
Intimidate /
Reckless 85/120/70/50/50/100 - Access to: ExtremeSpeed, Brave Bird, Acrobatics, Drill Peck, Close Combat, Nature Power
Intimidate / Anger Point /
Sheer Force 75/100/95/40/70/110 - Access to: ExtremeSpeed, Nature Power/EQ, Stone Edge, Rock Slide, Rock Climb
Shell Smash
Thick Fat / Huge Power /
Sap Sipper 100/50/80/50/80/50 - Access to: ExtremeSpeed, Aqua Jet, Crabhammer, Waterfall, Nature Power, Ice Punch, Superpower
Simple / Unaware /
Moody 79/85/60/55/60/71 - Access to: ExtremeSpeed, Aqua Jet, Crabhammer, Waterfall, Nature Power, Superpower
Reckless / Sap Sipper /
Soundproof 95/110/95/40/95/55 - Access to: ExtremeSpeed, Nature Power/EQ, Superpower, Stone Edge, Megahorn
Serene Grace 100/77/77/128/128/90 - Access to: Judgment [Fist Plate/Regular], Hyper Voice, Psystrike, Stored Power, Shadow Ball, Lovely Kiss
Synchronize /
Magic Bounce 65/65/60/130/95/110 - Access to: Lovely Kiss, Stored Power, Shadow Ball, Psystrike, Judgment [Fist Plate]
Volt Absorb /
Quick Feet 65/65/60/110/95/130 - Access to: Lovely Kiss, Thunder, Thunderbolt, Judgment [Icicle Plate], Stored Power, Shadow Ball
Hustle / Serene Grace /
Super Luck 85/50/95/120/115/80 - Access to: Lovely Kiss, Aeroblast, Hurricane, Hyper Voice, Judgment [Fist Plate/Regular], Aura Sphere, Shadow Ball, Thunderbolt, Flamethrower
Adaptability / Download /
Analytic 85/80/70/135/75/90 - Access to: Lovely Kiss, Judgment [Fist Plate/Regular], Hyper Voice, Dark Pulse, Thunderbolt, Ice Beam
Swords Dance
Immunity / Thick Fat /
Gluttony 160/110/65/65/110/30 - Access to: ExtremeSpeed, Crunch, Nature Power/EQ, Superpower, Fire Punch, Explosion
Also consider
Guts/Toxic Boost
Guts / Quick Feet /
Unnerve 90/130/75/75/75/55 - Access to: Fake Out, ExtremeSpeed, Facade, Nature Power, Crunch, Close Combat
Guts /
Scrappy 60/85/60/50/50/125 - Access to: Fake Out, ExtremeSpeed, Facade, Nature Power, Brave Bird, Acrobatics, Drill Peck, U-turn
Immunity /
Toxic Boost 73/115/60/60/60/90 - Access to: Fake Out, ExtremeSpeed, Facade, Nature Power, Night Slash, Close Combat, Fire Punch, Ice Punch, ThunderPunch
Flash Fire /
Guts 65/130/60/95/110/60 - Access to: Fake Out, ExtremeSpeed, Facade, Nature Power, V-create, Flame Charge, Superpower