how to extract pokemon crystal map

[lyokohack]

I've tried to extract the pokemon crystal maps with visual boy advance, but I have to combine several files into one.

Is there a good way of extracting the maps in a single image for each city?

 

[FAST6191]

Such things have probably existed in the various guides since the game was new, and made several times thereafter by various game guide makers.

If it was some unknown game then even if I can ROM hack I would probably still give very serious consideration to using an emulator (and its BG/map viewers or turning off layers), and maybe a cheat to walk through walls or something (at least an end game save) pressing print screen as I go. Have a reasonable plan (zig zag pattern being a general start to get the most for as little movement) and it goes pretty quickly.

Pokemon RPG games are however far from unknown, and possibly one of the most hacked franchises going (Mario platform, maybe Mario Kart and Sonic being the main three contenders for anything more) so there are probably a whole bunch of map editors out there for a game this old that in turn display the results as you are working on them. I am not familiar with current level editors/map editors for this generation so don't know specifics to point you at but the pokemon hacking forums and sites should list various things.
https://www.pokecommunity.com/forumdisplay.php?fn=rom-hacking-center might be a start there.

Equally the game does have a disassembly so you can probably use that as a more directed hack if you wanted to go that way.

 

[lyokohack]

thank you for answer , it's not the modding ROM hack I want, I just want to get the images back

I previously tried "Polished Map" on that site you showed me, but it doesn't have image export.

 

[Ryccardo]

For this specific case... https://i.redd.it/ep9zb6yrr8611.jpg and https://www.spriters-resource.com/game_boy_gbc/pokemoncrystal/

As for how they were made, I have to concur the "map viewer" (where "map" means the not-exactly-framebuffer tilemap) is the only universal least common denominator, some editors may have an export feature (I very vaguely remember that's in EliteMap and Lunar Magic which are definitely not for G/S/C)

 

[lyokohack]

For this specific case... https://i.redd.it/ep9zb6yrr8611.jpg et https://www.spriters-resource.com/game_boy_gbc/pokemoncrystal/

yes, exactly