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My bro is Shaymin-Sky
Doubt he'll top 3/5, but let's find out.
>Attack
Swords Dance boosts to +2
+2 252+ Atk Life Orb Shaymin-S Bullet Seed (5 hits) vs. 252 HP / 252+ Def Shuckle: 195-235 (79.9 - 96.3%) -- guaranteed 2HKO
Close, but not quite. But I have an idea!
+2 252+ Atk Micle Berry Shaymin-S Natural Gift (100 BP Rock) vs. 252 HP / 252+ Def Shuckle: 158-186 (64.7 - 76.2%) -- guaranteed 2HKO
Still nope.
Special Attack
Best setup move is Growth
+1 252+ SpA Life Orb Shaymin-S Seed Flare vs. 252 HP / 252+ SpD Blissey: 231-273 (32.3 - 38.2%) -- 96.9% chance to 3HKO
Not even close :-/
Defense
Setup: Use Worry Seed to gave Medicham Insomnia
252 Atk Mega Medicham Fire Punch vs. 252 HP / 252+ Def Shaymin-S: 120-142 (29.7 - 35.1%) -- 16.6% chance to 3HKO
Finally got one
Special Defense
No way to change out the weather, so my best bet here is Confide. Still totally screwed here though.
-1 252 SpA Solar Power Mega Charizard Y Fire Blast vs. 252 HP / 252+ SpD Occa Berry Shaymin-S in Sun: 271-321 (67 - 79.4%) -- guaranteed 2HKO
Went better than expected!
Speed
Scarfed Timid outspeeds Accelgor 582 to 427
3/5, not bad