All right, so let's say our base unit of measurement is the regular man, or the "Flynn."
Gaston, who is roughly the size of a barge and a man no one can fight, douse lights, bite, or shoot like, is I'd say, what, 1.5 Flynns?
Prince Ali, who is as strong as ten regular men, obviously clocks in at a Decaflynn.
Ice is stronger than one, ten, and a hundred men, and Elsa has the power of ice, so she has AT LEAST 111 Flynns. (That's as many as 74 Gastons, for those of you playing along at home.)
Malificent has all the powers of hell, so assuming 1 demon=1 Flynn, she's clocking in at 7,405,926 Flynns at her max. (That's very nearly 5 million Gastons.) However, she is likely overstating her power here, as I'm pretty sure 1 Philip+3 Good Fairies?5 million Gastons. She's probably closer to Elsa.
The obvious answer is Jafar+Pre-Freed Genie. Jafar wished to be the most powerful sorcerer in the world, so he is logically the next-most powerful sorcerer +X, where X is enough Flynns to make the contest one-sided. Then his third wish was to be an all-powerful genie, which would give him effectively infinite Flynns at the cost of a lamp, which unfortunately for him could be destroyed by Iago despite Iago's centiflynn of power.
