Help with few items?

[Shinoraku]

I solved my other problem
Now I'm trying to get the best weapons, but I know that some items are taking too long to get or aren't possible to get untill later parts of the game. But I don't wanna miss them... so...
Where do you get:

-Force Armlet
-Energy Crystal (I heard there's this guy dressed in black... Where? When? =/)
-Moon Stone

Thanks...

[Kyros]

I forgot which cards you get those from but I'd recommend find them that way. If you find the right people to beat in the card game you can have all of the ultimate weapons by the end of disc 1 ^_^ You could probably find the details at gamefaqs.

[Shinoraku]

the point is that I don't want to get 60 elyonle card... (I got lionheart already)
I need Moon stone and 6 energy crystals... I dunno where to get moon stone, and about crystal I heard there's a guy dressed in black that you fight? or something...