Many eidolon evolutions have minimum summoner level requirements.
For example, Alignment Smite, Energy Attack and Flight say "the summoner must be at least 5th level before selecting this evolution", Immunity, Poison and Tremorsense say "the summoner must be at least 7th level before selecting this evolution" and so on.
Is there a way (a feat or something else) that allows a multiclass character with low summoner level (but higher character level) to take such evolutions?
For other classes I've seen feats that "increase your effective XXX level by YYY" (Boon Companion, only for the purposes of animal companion properties) or class features that do similar things (spells per day for Arcane Trickster, Diverse Training for Eldritch Knight, etc.) but didn't see any direct or indirect way to do this for summoner's eidolon evolutions.
Is there a way to do something like that?
Best Answer
The feats that increase your effective level for class abilities, such as Boon Companion, all have a clause that says "...to a maximum effective XXX level equal to your character level." A single-class character can't use them to exceed their actual class level. These feats are solely meant to take a little of the sting out of multiclassing while still allowing you to Do Your Thing.
There is no such feat for summoners published in Paizo products, though there may be one in a third-party product. The summoner is already a very strong class, and while adding it wouldn't break the game, adding one is not necessarily a great idea. Since eidolons are the bulk of the power behind the class, at feat like that would allow a character to take 4 levels in any other class with very little downside.
If absolutely had your heart set on a feat like this (and you could talk your GM into it), you could do something like this:
Boosted Eidolon
Benefit: The evolutions you can select for your eidolon are calculated as though your class were 4 levels higher, to a maximum effective summoner level equal to your character level. If you have more than one eidolon, choose one to receive this benefit. If you replace the eidolon that has received this benefit, you may apply this feat to the replacement creature.