I'm taking note of some of your suggestions, don't expect anything, though.
CAS+ (don't want to write full name), you're pointing out something that I've never thought of: if this is a Remake of Gold, which is the continuation of Pokemon "Red", or if this is a Remake of Gold, which "should" be the continuation of Pokemon "Fire Red"... That's quite interesting... Hmmm...
Oscuridad, I don't know how to change the sound of the Charizard at the beggining (and the Nidoran at Oak's intro, by the way). If anyone knows, I'd be grateful!
Goku Goku, first, I don't think a single place should have a lot of legendaries. So, they'll be scattered through the map, in islands, or something like that. Even some will have their own story going around them.
Then, I don't know about characters from Hoenn being mentioned, perhaps...
And, about changing sprites, we'll see once I can decide which sprites I'm not going to use (I want to retain the sprites for the G.L in Kanto)
itsaplanet & cgnius, definitely Team Magma & Aqua won't be in the game (it requires A LOT of new sprites, so forget about it), kinda similar about Jesse/James. Besides, I think Carlos fills their role, by constantly annoying the player :P
And, that's about it. But, I have an announcement, and a question (it should go to a poll, but...)
Finally I put the Headbutt Trees, and they're working! Only thing that confuses me a bit is the Poke that fall off the tree, because guides in gamefaqs say that only in "mountain" areas you'll find Aipoms, then I go, in Gold, to Route29, and an Aipom falls, so, anyone knows a more reliable source of information?.
Anyway, I'm faced with two options, since I can't make a TM (EDIT: nor a Move Tutor :() teach you the move "Headbutt", you could learn the move "Mega Punch" from the person in Illex, like it is at the moment in the game, then you use M.P. to shake trees. Or... you could get a Pokemon that knows the move "Headbutt" from the same person, then you use Headbutt to shake trees.
Both options means that you're stuck with only one pokemon available to use the move right away, and the only way to make another one is by breeding (or, for the second option, getting another pokemon that knows Headbutt).
Which of the two you like more?
EDIT: Oh, I made a quick video, if you want to see it...
http://www.youtube.com/watch?v=5F2Y28WkiC8