Platinum has everything except:
-Kanto starters
-Mewtwo
-Johto starters
-Johto legendaries
-Hoenn starters
-Hoenn legendaries
-Glameow line
-Stunky line
Seedot, Lotad, Mawile, Sableye, Zangoose, Seviper, Caterpie, Weedle, Ekans, Sandshrew, Growlithe, Vulpix, Teddiursa, Pineco, and Shuckle are also locked behind owning the Generation III games, and the Regis are locked behind an either an event or the Generation III games.
HGSS has everything except:
-Regis
-Sinnoh starters
-Glameow line
-Stunky line
-Leafeon and Glaceon
-Magnezone and Probopass
-Lake trio
-Heatran
-Cresselia
Cranidos, Shieldon, and the Creation Trio are also locked behind trading a key Pokemon or item over from Platinum.
