Yep. You got the right spot.

Personally, I've never hacked Pokemon games before. Hell, I've barely even hacked any GameBoy games before. But I can still answer a few questions.

1. Yes. But editing the sprites will only make whatever Pokemon you edited look different. You'd still have to change stats, attacks and anything else. The sprites are probably compressed. I recommend using Tile Layer Pro or YY-CHR to look through the game for the sprites. Good luck with that one.

Everything else is really extensive, and would probably require learning Assembly. I'd wait until you got handy with the basics first. Also, read the RHDN FAQ:

The Newbie Package of REQUIRED Material

ROMHacking.net FAQ: You ask, we answer!
ROMHacking.net Getting Started Section: Newbies Go HERE!
ROMHacking.net Documents Section!
How to ask questions the smart way.
On the Essence of ROM Hacking

Good luck with your hacking pursuits!

~DS

Don't take my word up on this, since I've never decompressed any games' graphics before, but I bet you won't see the graphics all nice and pretty from the get-go. You might see pieces of Pikachu's ear mixed in with its feet into one giant monster thing you'd never believe could exist. Also, you won't see the graphics in its in-game colors because graphics data and palette data are separate.

Pokemon Gold is a GBC game, not GBA.

1. Yes there is It's called AGIXP and it's really easy to handle actually. It insers sprite data and palette data in one go and recompresses them. Of course you can also dump with it and do other nifty stuff. The only thing is, I believe there is no English version, which might actually be fine with you - or not :| Linkage: Here

2. How would I know? Maybe read a doc or something. Lol, I never bothered with Attacks. On the other end, I think it's the chance of a critical hit.

3. Everybody did. You can add encounters to it, when you read my doc and repoint all the data Linkage: Here. It's in English and covers only English offsets, so no worries. It explains where to find the data and how it's made-up in one of the Appendices.

4.  You don't do that, right now. It is accomplishable and very easy to do actually - that is, if you do know assembly.

5. Do you mean, like the battle sprites and ingame sprites, or their behavior? For battle sprites see 1. for ingame sprites use TLP, tile molester, YY-Chr, or whatever you prefer. They are uncompressed at 0xC0000 in the Rom

6. You would go easiest with a table file and thingy32, translhexion, snesedit, or some other hex editor that is capable of editing. You'll find then on the lefthand side of this very window unter "Utilities". Same goes for the tile editors. Find the text and edit it. Do read the docs DarknessSavior linked to

cYa,

Tauwasser

I meant actually editing what Pokemon they are to insert something different.  For example, making Entei appear as a Flareon, Suicune as a Vaporeon, and Raikou as a Jolteon.

here's an english version...

http://skeetendo.110mb.com/AGIXP411%20English.zip

Oh snap! Sweet! Still, I only meant in jest- Sorry about that.