what stats do i need? what cross job skills should i use?

[Estellios]

No "raw" stat modifies Evasion or Crit rate, but like you said there is now a larger amount of gear that gives those stats (especially Evasion) and in higher potency. If you want to make a set or focus on Evasion it's best to grab whatever gear raises evasion and meld Evasion materia onto Body and Feet.

PGL can tank in most situations as long as the rest of the party doesn't push out high damage/curing immediately at the start of a fight, and as long as you are able to pump out consistent damage. People have used PGL tanks on Ifrit just fine, although apparently because his level is so high Evades are really rare and it's best to gear for HP in that situation.