The gods are not final MMO bosses. You can't just research their moves and playstyles and build a single gameplan against them. All the demi-gods can hope for is to improve themselves by grinding tech skill and improving their mentality. The demi-gods have potential to take out any god but they are held back by not tapping into that potential consistently. This starts by being consistent mentally. Research is helpful but it can only help so much when the gods are masters of adapting.

Often times when people ask these questions, they've hardly played the game at a competitive level or consistently go to tournaments.

It's having many eyes to do what you would do anyways - research.

And this is just ignorant in my eyes to say. These guys often know their characters better than anyone else. Who is going to help Axe innovate in the Peach matchup? Any help that other demi-gods would give would hardly help when Axe probably knows that character better than anyone. What other demi-god plays Falco? What other demi-god plays Sheik? Even if you get Mew2king and Plup together to lab out against Peach, there are playstyle differences and each may argue that a certain move is better in a certain situation.