See, I think otherwise. I try to collect all Pokémon, legendary or not. That's why I am working on my Black Pokédex and currently playing games based on what I still need.
I will have to go to Pearl and Platinum soon since I'm nearly done Kanto (playing W2 a bit for Growlithe from Virbank Complex), but I guarantee you everything from Starly to Froslass will be located and brought into the game. Because I collect Pokémon, not just legendaries. ;)