Best armour overall: Break HP Limit, Auto-Haste, Auto-Protect and Ribbon. (Downside is building HP is monstrously time-consuming)

Ultimate Arena Creation armour: Auto-Haste, Auto-Protect, Auto-Potion and Auto-Phoenix.

For the PAL/International version of FFX, making these armours will stand you in good stead for the Dark Aeons/Penance: -

Ultimate Dark Aeon armour:
Auto-Haste, Auto-Protect, Auto-Phoenix and Ribbon/Stoneproof. (Useful for all Dark Aeons with the exception of D. Yojimbo)

Ultimate D. Yojimbo armour:
Auto-Haste, Auto-Protect, Defence +20% and Ribbon/Stoneproof.

Ultimate Penance armour:
Auto-Haste, Auto-Protect, Auto-Potion and Defence + 20%. (can also be used for D. Yojimbo if your intention is to create as few armours as possible)

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Is there anything hidden / special about celestial weapons?

They reduce the defence stat of ANY ENEMY down to 0 so long as it's a physical attack not an Overdrive assault. However, they don't carry the Piercing ability and neither can you customise it on the weapon. Therefore, maximum damage cannot be attained when against heavily armoured foes whilst at low stats unless you've paved the way using Armour Break. However, when your guys are dealing 99,999 damage to nearly everyone, Armour Break is no longer required.

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What about the stats? What should i max? since you can only max a few stats

Str, Def, Mag Def, Agility and Accuracy are parameters in which I believe you should max out. Magic is secondary and you can keep Evasion in the hundreds. HP is purely your decision.

For Dark Aeons/Penance, your Luck stat should be maxed out to the minimum of 130.

Defeating Mimics inside treasure chests while equipped with a weapon with the Gillionaire ability will net you 100,000 gil each time. Which makes them a great way for earning easy gil as their appearance rate is very good in the Omega Ruins. Rikku's Celestial Weapon: The Godhand will already have this ability.

To make a profit in the Monster Arena, sell the equipment that were dropped by these monsters/creations. Or just keep those that are useful such as weapons with Break Damage Limit/Triple AP/Overdrive > AP and sell the duplicates. Triple AP + Triple Overdrive + Overdrive > AP is a potent combination for amassing incredible amounts of AP especially if you're training with Cactuar King or Don Tonberry in Stoic/Comrade mode.

well heres the armor i used

break hp limit
auto protect
auto haste
hp+30%
this armor has had PERFECT results for the arena creations (i used them in 1 on 1 fights)
that was just for fun though

as stated
Auto-Haste
Auto-Protect
Auto-Potion
Defence +20 percent

is the best ribbon isnt really needed i guess since you could auctually summon a aeon ot get past some moves. but im just saying what i have seen on youtube videos since i dont have dark aeons or peneance