All the legendaries are catchable, except mew, mewtwo and ho-oh I think...
I found two more minor bugs.
The first one, is at the berry house (between mahogany and ecruteak). After I won all the trainers in all categories, I went to the old man's house and he gave me several berries.
The next time I try to enter the competition (after I left the building), my game freezed. It happened many times, and now I am not able to go there. I forgot to mention, that when I won the trainers, the next time I could go to the old man without battling which is another bug I think. I also did it several times to earn berries that I didn't deserve!
The second one is at the "old" Bill's house, where his grandpa lives (at Cerulean). I used to visit him to play the Tm finding game. But, after I got Lugia (i don't know if there something to do with it) whenever I try to enter the room where the event takes place, my character is transferred to another place and i cannot move (sort of freezes the game)...
Edit: Will liquid crystal become a sticky thread for this month?
I don't know why, but my signature does not appear..