| dragonhunterq |
Prerequisites
Some feats have prerequisites. Your character must have the indicated ability score, class feature, feat, skill, base attack bonus, or other quality designated in order to select or use that feat. A character can gain a feat at the same level at which he gains the prerequisite.
| Protoman |
The feats chapter.
Prerequisites
Some feats have prerequisites. Your character must have the indicated ability score, class feature, feat, skill, base attack bonus, or other quality designated in order to select or use that feat. A character can gain a feat at the same level at which he gains the prerequisite.
A character can't use a feat if he loses a prerequisite, but he does not lose the feat itself. If, at a later time, he regains the lost prerequisite, he immediately regains full use of the feat that prerequisite enables.
| born_of_fire |
There are a few exceptions to the prerequisites for feats. As a class ability, rangers can get certain combat feats without having the prerequisite feats first. There are other classes but I don't know all of them exhaustively. If a class has this ability, it is clearly spelled out in the description so you could look into that but I can't think of any that give Improved Trip. Monk maybe? I could be thinking 3.5 though.
There are also ways to sub one ability score for another. Swashbuckler has a class ability that allows you to use Cha instead of Int to qualify for combat feats. The Guide to the Class Guides on the advice page has a link to a thread dedicated to swapping x ability for y.
OilHorse
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No, you can't. Thing is, though, it would be an easier way to handle it all, given that you can already retrain your feats as you gain levels.
Not sure I read what you are saying right but:
The old feat can't be one you used as a prerequisite for a feat, class feature, archetype, prestige class, or other ability. If the old feat is a bonus feat granted by a class feature, you must replace it with a feat that you could choose using that class feature.