Originally Posted by Roze
I know, that's why I made sure to say "main series game". I like Colosseum and XD but they really weren't anything like RBY or GSC etc.
The only thing that bothers me about that quote is, you can trade your Pokémon from Colosseum and XD. Heck you can even EV train your Pokémon in their battle domes if you knew the line ups or just use it as an alternative to the level grinding from playing S,R,LG,FR,E.
I didn't get around to finishing the two Game Cube games till after gen 4 was out and I found out you can trade gen 3 into 4, so I went and finished my XD to get the legendaries from it. I would count them as part of the "main series Pokémon game" considering you can trade into and out of them.
However I do understand how one would not count them as the main series, I would more count them as not the portable kind so it's more the "portable series" as the ones that would cont. Also that no grass wild Pokémon system existed, though you could catch Pokémon in XD with a weird system they had.