Originally Posted by
Babekeke
Wait a sec, even without going into adoulin, and even without joining a party, you can get 119 gear!
Do salvage/dynamis to make gil. Use gil to get a 119 weapon from Port Jeuno.
Do RoE to get sparks. Use sparks to get lvl 109 AF/Relic upgrade papers. Use gil from further dyna/salvage runs to buy the items required to upgrade your AF/Relic to 109. Rinse and repeat for 119.
Now onto the Adoulin question: Yes.
As Doombringer mentioned; Skirmish is likely soloable. Particularly due to the fact that you can use Trust in there now, so it's actually you, your friend and 3 Trusts. Even if you can only manage to solo Yorcia, and can't manage RaKa skirmishes, it's possible to farm enough wings from Yorcia to trade them to RaKa wings, and then trade them up to the KIs to make your armour 119. Then just buy the Wailing Stones to Augment it.
Oh, and as for Delve NMs, maybe you can't solo/duo bosses, but you can certainly solo many of the other Delve NMs, either inside or outside of the fractures (to farm Plasm).
If you can't manage to (or don't want to) join a PUG for delve bosses, there are people out there who will sell them to you.