Question

on the other pokemon's set

Answer 1

From Bulbapedia:

Forewarn shows the opponent's move with the highest base power. If two or more moves are of the same base Power, one will be chosen at random.

Comments

then why did it alert to e-quake on my metagross when i also had meteor mash

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From Pokemaster's Bulbapedia reference: If two or more moves are of the same base Power, one will be chosen at random. E-quake and Meteor Mash have 100 base power.