>>39966775>a country the size of the United States could comfortably house the entire human populationYou aren't accounting for arable land land and other resources. When people talk about concern with over population they are talking about more than just the physical space people take up.
Maxie's plan is dumb, but the assumption is that the land he creates will be used for more resources not for people to inhabit. Water and sea-life is just as important though. The fact that so much of Japan's diet is composed of stuff from the sea is the reason why such a large populations is are to live on the islands with such little arable land.
Given that Hoenn is is Pokemon Japan and the water sustain a decent bit of the population Maxie is just as dumb as Archie.
If this plot took place in a different region his idea might not be as dumb.