Breath of Fire IV help please

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1)There are a couple of dragon forms which upgrade to nicer ones (myrmidon to knight), but how do I actually go about upgrading them???

2)I have only found two dragons but I think there are more (they give the player Fulguration and Rainstorm). If there are more, how do I find them?

I've tried a few walkthroughs with no luck.
I just want to put this game to bed.
Any help is much appreciated.
Please & thank you.

[dragon evocations problem has been resolved, but I still don't know how to gain the evolved Ryu dragon forms]