I'm talking about replacing the Pokemon center in the game with my own custom Pokemon center
I added the tiles into tileset2 (pallet town) in advance map but I couldn't figure out how to replace the FR Pokemon center tiles with my tiles
Well, that would depend on what part you're having trouble with
A slightly more detailed description (what doesn't work/what breaks your game/etc.) goes a long way! Although I'm far from an expert, I've seen some common problems around the forums, and I might be able to give a tip or two.
I inserted the Pokemon center into tileset 2 (pallet town) and when I tried to take the tiles that I enserted into tileset 2 I couldn't figure out how to replace my Pokemon center tiles with the original tiles