All the scripting tutorials on this site are for the extremely outdated PokeScript. Newer tools such as XSE do all this much easier and without having to jump through the hoops you do to use PokeScript. This site has been left up for reference but the downloads have been removed - you should be using XSE instead.
This site contains tutorials and other useful resources for hacking Pokemon Fire Red. Some of the material may be applicable to other versions, but it has not been tested - proceed at your own risk.
This site assumes you are using PokeScript, and in most cases, have a decent knowledge of Rubikon scripting (Pokemon advance scripting language) already.