I'll do better than that. I'm tracing down every Corocoro during a game development to see what they have.
July 2002 (Ru/Sa): This was the first time the games are referred to by their current names. (before, they were simply referred to as Pokemon Advance) lots of screenies for then-new double battles and new pokemon.
2004 (Emerald): Release date, details on Emerald's altered story, Battle Frontier.
2005 (D/P): D/P is delayed for another year
2006 (D/P): Release date, Box art (and the legends associated with them), more pokes, evil team, rival, D/P's anime, contest dressup, Sinnoh map
2008 (Platinum): release date, Battle Frontier, new WiFi area, details on Shaymin/Giratina's new forms, Charon and Looker
2009 (HG/SS): Eusine, info on other legends, details on Pokeathlon
2010 (B/W): more pokemon, Fennel, the rivals, Black City/White Forest, N, Live Caster, C Gear's Pass By feature, details on Triple Battles, Global Link, new route number system
2013 (X/Y): Legend types, more pokes, two Gym Leaders, evil team, Sycamore, PSS features
