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Power Attack states that if you wield a 2-handed weapon, you deal +2X damage

Monkey Grip states that you may take a 2-handed weapon and use it in 1 hand

If you use a 2-handed weapon in 1 hand, do you still get the +2X, or do you just get regular X??

No, you would only get the regular bonus. And you would also only get your normal bonus for strength instead of 1.5X for using a one or two handed weapon with both hands.

Now, if you used a large two handed weapon on the other hand, then you would reap the benefits of both the 1.5x strength modifier an the 2x power attack modifier.

Unless I'm reading Monkey Grip wrong, it says that the effort you need for the weapon doesn't change. A one-handed weapon remains a one-handed weapon. So no twohanded weapon in one hand. Granted, a Large Longsword in does as much damage as a Medium Longsword.
Unless you're very big (maybe Huge/Gargantuan/Colossal and up...), the increased damage dice don't outweigh the attack penalty. Better off just Power Attacking for that same penalty.

This is true you can not use a two-handed sword in one hand using those feats. There is a feat I had found, lighten weapon, it can be taken more then once for specific weapons and it lets you use any weapon as one lower size. So let's say you take the feat for a bastard sword you could then weild it with one hand. Also if you are a small or tiny creature this feat could come in very handy, since for such a creature a longsword would be two-handed. Thus you would be able to use the longsword with one hand

Why? Small creatures have appropriately sized weapons. The increased die isn't worth a feat.

I had made a pixie fighter for a laugh and i had taken the feat. It actaully made a huge difference when it came to getting big hits against enemies compared to what i would have done without the feat.

1d6 vs 1d8?

a long sword for a pixie is dropped to a 1d4 not a 1d6. A pixie is a tiny creature not a small so there for it would drop from the 1d8 for a medium size to the 1d4 for a tiny

Still not impressed. An average increase of 1 damage is still low end. (Tiny Creature using a small Longsword. To use a medium one, the feat would have to be taken twice, I presume?)

Actually the feat is only required to be taken one time. So if used right can be quite proficient

That's 4 extra damage, IF you're lucky, at the cost of one feat. I'd pass.