This actually isn't too bad of a setup.
I believe Divine Defender or something like that gives a bunch of buffs. Also go Stonelord for the defensive axis. Plenty of offensive focused archetypes, and Hospitaler or Oradin to handle all the healing. The martyr archetype basically gives out the effects of bardic performance.
If you must have Paladin as the main class, I'd recommend looking into the variant multi classing rules for filling in some abilities that you may lack. If paladin can be the VMC, any normal class will do.
My favorite Paladin archetype is the Chosen One.
Holy Tactician is a good archetype to grant bonus feats and make it even easier to hit enemies.
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Have someone snag the trap spotter trait and be a little smarter for skill points. Have everyone be fey foundlings. Everyone. Look at the evangelist prestige class and the massive benefits.
Now look at the divine obediences needed. An all paladin party is the best party for that class.
Some give charisma to things so look at them. Really anything from that book works.
Or have everyone be mounted archers. You can never be caught with the right steed and you can pincushion anything.
I like the warrior of holy light archetype: trade spells for extra lay on hands and other abilities.
Also having at least one of them take the eldritch heritage feats could add some much needed diversity.
You'll need to grab some swarmbane clasps fairly soon, since you won't have any spell damage.
UNSANCTIONED KNOWLEDGE - If it's allowed it's gonna be a huge game-changer for this group.
Is there a provision for running Wrath without Mythic rules? If so, maybe consider running Gestalt (with everyone having a Paladin on one side) rather than Mythic. It'll give a good variety to an all-Paladin party while actually being less complicated and less powerful than Mythic.
One example party could be:
The Hardened Veteran (Paladin (Tortured Crusader) // Inquisitor)
The Righteous Fury (Paladin (Oath of Vengeance) // Bloodrager)
The Arcane Ascetic (Paladin (Enlightened Fist) // Sorcerer)
The Prophetic Healer (Paladin (Hospitaler?) // Oracle)
The Guiding Light (Paladin // Bard)