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I'm biased since he's one of my favorite Pokemon characters but I think people don't give Archie enough credit. Yes, it was stupid of him to think he could control a legendary and that his plan wouldn't just result in everything drowning. But his motivation wasn't bad. He wanted to stop humans from encroaching on water Pokemon's territory and polluting the ocean. He hated how humans cared only for their own advancement to the detriment of Pokemon + the environment, and thought Kyogre would help return things to their original, natural state.
Basically he's more an extremist environmentalist/animal rights activist than a complete idiot who just wanted to drown the world for no reason.