Im going to be doing the gold saucer extras soon enough for w summon, omnislash and final attack (thats all isnt it?). Few questions

How much GP will i need to do get the whole lot of items without leaving (duh)?
What level should Cloud be about to do it all, i have a ribbon and mystile armor and his ultimate weapon (might be using other thing for AP ).
During the battles do you get AP/EXP/Gil.
Do you finish the battles seperately or do you fight through them all as one battle (mainly for summon and "all" issues)


Few questions on equipment.

Ive read in alot of places that sprint shoes are good for battles, mainly ruby and emerald. How do i get these?
What weapons are best for Cloud, Red and Tifa, that actualy have AP growth, basicly for leveling up materia yet having strength at same time (lots of slots and attack basicly).
Whats the best armor and how is it obtainable?