Anybody remember how adorably stupid the team leaders were in Ruby & Sapphire? There plans made NO sense.
Aqua's Plans: Steal a submarine, try and decommission an active volcano (????????????????????????????????) so it can fill with rainwater (again, ?????????????????), reawaken an ancient ocean deity to make the week's forecast a 100% chance of rain, leading to the entire continent being flooded and drowning all the people and land pokemon because reasons.
As stupid as those sounds, Magma was even dumber.
Magma's Plans: Steal a submarine despite a life-crippling phobia of water, try and make a volcano erupt in order to create more land in the ocean thats actually a fare amount of distance away (but also killing everyone on the volcano which includes the entirety of team magma and its leader), and reawakening an ancient deity of land in order for to cause total sunshine, causing the ocean water to evaporate (yeah, sure Magma. You do that), killing all the sea pokemon. And then killing all the land pokemon they were trying to help in the process because they'd have nothing to drink. And all the people, too.