So according to the rules, all details about each team member (including EVs, Natures, etc.) must be given when posting a team on the Battle Subway, and if not, the question is against the rules and should be hidden.
However, many players are new to competitive battling and do not deserve to have their questions hidden simply because of their lack of knowledge about Pokémon.
One solution to this problem would be to just inform every single person who posts a team like this about Pokemon stats and such. I see how this could get very tedious, however.
My idea is that when someone clicks on "Ask a Question" on the RMT, the page they type it onto should have an alert similar to the one when asking a question on the META ("This is the META section, for asking questions about this site..."), but it should say something like this:
Before posting a team, make sure you include all of the specifics for each Pokémon in it, including held items, abilities, EVs, natures, and movesets.
Again, this is just my idea, and as such is open to constructive criticism. But I think this will help new site members who want feedback on their competitive teams.
Optional: If someone still doesn't give enough information on the team members after reading the memo, then another site member should politely explain to them what they're missing, and maybe could give a link to a page on this site that will help them.