Frog Drop

Frog Drop is a Blue Magic spell in Final Fantasy IX that Quina can learn from eating a Gigan Toad. It is one of the first such magics available, with the cost of 10 MP. The amount of damage that Frog Drop may do is as follows:

$$Damage = (Quina's Level) \times (Number of Frogs Caught)$$

With this in mind, it is possible to easily get Frog Drop to deal 9,999 damage, making it one of the four strongest attacks in the game, tying with Zidane's Thievery, Beatrix and Steiner's Shock, and Freya's Dragon's Crest.