Alright, thinking back, I should have checked the previous articles. I didn't think of doing that for whatever reason.
How about something that has to do with why Pokemon were given abilities? (I know, abilities, but that's my mindset right now.) Example: Clear Body... You have the Regis (baring Gigas) Metagross, Klinklang, and Tentacruel. If Clear Body where to be defined by the metallic and hard sort of vibe the others give it, why would it be given to a jellyfish?
Also, if it hasn't been mentioned, a fifth generation bug-type analysis would be pretty cool (mentioning Yanmega, Volcarona, Venomoth, Heracross, Scizor, ect... How bugs have kind of reached a pinnacle of success) This is just my opinion on the matter.
Again, this is an opinion of mine, but something could be written about how the massive amount of usable Pokemon allows many good ones to remain 'undiscovered'. (Encourage people to be creative?)
Just base-line ideas for some articles.