IIRC, a Helping Handed +6 Fire Gem-boosted V-Create from max Attack Pure Power Victini in Sun on a level 1, min Defence Paras with Dry Skin with 2 Flower Gifts is the strongest move in the game
>+6 252+ Atk Fire Gem Pure Power Victini Helping Hand V-create vs. -6 0 HP / 0- Def Dry Skin (custom) in sun on a critical hit: 17064180-20075508 (142201500 - 167295900%) -- guaranteed OHKO
Although this calculation is without taking the 2x Flower Gift into the equation
Let me just decilamise that:
>17,064,180-20,075,508
>17 to 20 million
