here's what i'm using on my current gbu team to check rain:
@ Fighting Gem
Careful Nature
94 HP / 212 Atk / 204 Spe
Protect
Sunny Day
Leaf Blade
Close Combat
EVs and nature ensure virizion can live a helping hand boosted life orb draco meteor from kingdra (and consequently, every other draco meteor) and still outspeed neutral base 100's like salamence. close combat can one-shot chople tyranitar, the afore mentioned kingdra assuming minimal defense investment, and some scizor (the one that outspeeds metagross) with fighting gem, and leaf blade rounds out the coverage. sunny day is key though, since i can kill the politoed without much resistance because i don't carry an auto weather of my own and soften hydro pumps that would've KO'd. outside of rain, it causes blizzards to miss, excadrills to slow down, and my heat waves obviously do more damage. virizion makes a great anti rain mon and can still bring the hurt so i reccomend trying it out if you have rain troubles. :)
VIRIZIONNNNNNNNN <3
another cool EV Spread is 116 HP / 220 Atk / 132 Def / 4 SDef / 36 Speed Adamant
Also, I usually go with Leaf Blade / Sacred Sword / Quick Attack / Protect to pick off Sash mons and that it was originally used on a Sand team to counter Rain.
here's some calcs:
Survives:
252+ SpA Cresselia Psyshock vs. 116 HP / 132 Def Virizion: 116-138 (64.08 - 76.24%) -- guaranteed 2HKO
252+ SpA Cresselia Ice Beam vs. 116 HP / 4 SpD Virizion: 68-80 (37.56 - 44.19%) -- guaranteed 3HKO
252+ Atk Tyranitar Fire Punch vs. 116 HP / 132 Def Virizion: 106-126 (58.56 - 69.61%) -- guaranteed 2HKO
252+ Atk Metagross Meteor Mash vs. 116 HP / 132 Def Virizion: 106-126 (58.56 - 69.61%) -- guaranteed 2HKO (Zen Headbutt has a 68.75% chance to OHKO)
252 Atk Garchomp Dragon Claw vs. 116 HP / 132 Def Virizion: 76-90 (41.98 - 49.72%) -- guaranteed 3HKO (Adamant: 252+ Atk Garchomp Dragon Claw vs. 116 HP / 132 Def Virizion: 84-99 (46.4 - 54.69%) -- 57.03% chance to 2HKO)
252+ Atk Technician Scizor Bug Bite vs. 116 HP / 132 Def Virizion: 93-111 (51.38 - 61.32%) -- guaranteed 2HKO
252+ Atk Fighting Gem Hitmontop Close Combat vs. 116 HP / 132 Def Virizion: 150-177 (82.87 - 97.79%) -- guaranteed 2HKO
252 SpA Latios Psyshock vs. 116 HP / 132 Def Virizion: 152-180 (83.97 - 99.44%) -- guaranteed 2HKO
252 SpA Dragon Gem Latios Draco Meteor vs. 116 HP / 4 SpD Virizion: 144-171 (79.55 - 94.47%) -- guaranteed 2HKO
252 SpA Life Orb Thundurus Hidden Power Ice vs. 116 HP / 4 SpD Virizion: 83-99 (45.85 - 54.69%) -- 47.66% chance to 2HKO
252 SpA Life Orb Thundurus-T Hidden Power Ice vs. 116 HP / 4 SpD Virizion: 91-109 (50.27 - 60.22%) -- guaranteed 2HKO
252+ SpA Life Orb Hydreigon Fire Blast vs. 116 HP / 4 SpD Virizion: 153-182 (84.53 - 100.55%) -- 6.25% chance to OHKO
252 SpA Dragon Gem Hydreigon Draco Meteor vs. 116 HP / 4 SpD Virizion: 141-166 (77.9 - 91.71%) -- guaranteed 2HKO
252+ SpA Heatran Heat Wave vs. 116 HP / 4 SpD Virizion: 152-180 (83.97 - 99.44%) -- guaranteed 2HKO (Single Target!!)
252+ SpA Abomasnow Blizzard vs. 116 HP / 4 SpD Virizion: 144-170 (79.55 - 93.92%) -- guaranteed 2HKO (Single Target!)
252 SpA Life Orb Zapdos Heat Wave vs. 116 HP / 4 SpD Virizion: 117-138 (64.64 - 76.24%) -- guaranteed 2HKO (Single Target!)
252+ SpA Life Orb Chandelure Heat Wave vs. 116 HP / 4 SpD Virizion: 159-190 (87.84 - 104.97%) -- 31.25% chance to OHKO (double target)
252+ SpA Volcarona Heat Wave vs. 116 HP / 4 SpD Virizion: 116-138 (64.08 - 76.24%) -- guaranteed 2HKO
252+ SpA Volcarona Bug Buzz vs. 116 HP / 4 SpD Virizion: 70-84 (38.67 - 46.4%) -- guaranteed 3HKO
+2 252+ SpA Volcarona Bug Buzz vs. 116 HP / 4 SpD Virizion: 139-165 (76.79 - 91.16%) -- guaranteed 2HKO
Kills:
220+ Atk Virizion Sacred Sword vs. 252 HP / 4 Def Tyranitar: 232-280 (112.07 - 135.26%) -- guaranteed OHKO
220+ Atk Grass Gem Virizion Leaf Blade vs. 252 HP / 252+ Def Rindo Berry Gastrodon: 174-206 (79.81 - 94.49%) -- guaranteed 2HKO (not many run 252 HP / 252 Def Bold Rindo)
220+ Atk Grass Gem Virizion Leaf Blade vs. 252 HP / 4 Def Politoed: 240-284 (121.82 - 144.16%) -- guaranteed OHKO
220+ Atk Grass Gem Virizion Leaf Blade vs. 252 HP / 4 Def Rotom-W: 182-216 (115.92 - 137.57%) -- guaranteed OHKO
220+ Atk Virizion Sacred Sword vs. 252 HP / 4 Def Hydreigon: 138-164 (69.34 - 82.41%) -- guaranteed 2HKO
220+ Atk Virizion Sacred Sword vs. 252 HP / 4 Def Abomasnow: 162-192 (82.23 - 97.46%) -- guaranteed 2HKO
20+ Atk Grass Gem Virizion Leaf Blade vs. 252 HP / 4 Def Rotom-W: 182-216 (115.92 - 137.57%) -- guaranteed OHKO
220+ Atk Grass Gem Virizion Leaf Blade vs. 4 HP / 4 Def Terrakion: 206-246 (123.35 - 147.3%) -- guaranteed OHKO
220+ Atk Grass Gem Virizion Leaf Blade vs. 4 HP / 4 Def Kingdra: 100-118 (66.22 - 78.14%) -- guaranteed 2HKO
220+ Atk Virizion Sacred Sword vs. 252 HP / 252+ Def Chople Berry Ferrothorn: 39-46 (21.54 - 25.41%) -- possible 4HKO
220+ Atk Virizion Sacred Sword vs. 4 HP / 4 Def Excadrill: 188-224 (101.07 - 120.43%) -- guaranteed OHKO