[RPG] Ride By Attack and Pounce on a mount

Leap Attack improves your usage of the Power Attack feat after a jump that meets the qualifications laid out in the feat. Power Attack’s penalties and bonuses last for an entire round, so when you use Power Attack (“On your action, before making attack rolls for a round, you may choose to...”—when you choose to, that’s using Power Attack) after triggering Leap Attack, the larger bonus that you get lasts as long as that usage of Power Attack does (“The penalty on attacks and bonus on damage apply until your next turn”).

In other words, yes, the benefit from Leap Attack applies to all attacks made until your next turn: extra attacks from pounce, attacks of opportunity, whatever.

Also of note: Leap Attack uses the very awkward phrasing “+100% the normal bonus damage from your use of the Power Attack feat.” Because it is adding a certain amount of damage (100% of your Power Attack bonus damage), rather than simply doubling that bonus, it does not count as multiplication for the purposes of 3.5’s weird math. That is, if your normal damage bonus is 2×penalty = +40, Leap Attack adds 100% of that (+40) to get +80, rather than simply doubling which, in this case, would be doubling something already doubled—resulting in 3×penalty = +60 damage total instead of +80.

And then on top of that, if your attack’s damage total is also being multiplied (e.g. with Spirited Charge or whatever), that multiplies the damage bonus according to regular math, not weird D&D math. So if your attack would deal 2× damage, the bonus from the Leap Attack + Power Attack here would be 2×[(2×penalty)+(2×penalty)] = +160.

These numbers get very large very quickly, because multipliers are powerful. Which is exactly why the rules usually have multipliers add together, rather than applying according to the normal rules of mathematics—but then they went and ruined it by printing stuff like this that gets around that rule. The result is the Übercharger.

RAW, no, Valorous Charge applies only to the attack made at the end of a charge. RAW, pounce gives you a full-attack after that attack.

But as described in that answer, basically no one ever plays it that way. Everyone plays pounce as replacing the attack on the end of a charge with a full-attack. And then we get into a conundrum: do all those attacks still count as being “used in a charge” when we pounce?

For the purposes of optimization discussion (which tends to assume favorable DM rulings as part of the optimization game), the answer is yes. This is part of what makes the Übercharger (though many other things are also being used, most of which are sadly pretty explicit). In my experience, most of the D&D-discussing Internet accepts that this is how things work (many of them think it’s RAW), and then simply just choose not to do that and advise others not to do that since it’s bad for the game. Knowing how an Übercharger works can be useful, since you can make a partial-Übercharger with power levels appropriate for your own game.

But for myself, I tend to actually like to run pounce as-written. Yeah, it means an extra attack, but it makes the whole thing a lot cleaner and clearer. If you really dislike that, you can always do something like “the first attack” or “the first successful attack” gets those benefits, and the rest do not.