This is just a compilation of all useful links you could need for this game. Feel free to message me if you have other to add to the guide!
[section=RPGClassics] This website is an incredible source of information! You can see exactly all enemies in each level, which one to kill to progress, all items, and much more!. This will be very useful when routing the game.
http://shrines.rpgclassics.com/gba/shiningsoul/index.shtml
[section=(TAS) Shining Soul - Any% Archer (Normal) in 49:46 by DarkKobold] Use this video in addition to his submission notes found here: http://tasvideos.org/2683S.html
[section=Oxn.free.fr - Loot Tables + Tons of useful information] Original: http://oxn.free.fr/ Google Translate: https://translate.google.com/translate?hl=sv&sl=fr&tl=en&u=http%3A%2F%2Foxn.free.fr%2F
This site is insanely valuable! You can check various information, but most importantly the loot table! You can see what drops in specific areas by enemy drops, chests and boss chests. All then split between all 4 classes for more precision too. So if you want to know how to get a specific item as well as the change for it to drop, then use this site!
[section=Shining Force Central - List of Forging Items & Rare/Unique Equipment] This could be useful for preparing Advance Mode characters. So knowing which ores gives which items as well as over nice tidbits is always useful.
[section=GameFAQs] I'm not sure if there's anything really useful here, but it's worth noting just in case.
