Sounds just like a pony-doesn't it.
First check for physical issues.
Teeth/back/saddle/pad- and most important feet.
Even though you may have the best Farrier in the world if his feet are out of balance so will everything else.
Ulcers ? If he is a show pony or in training to be one that causes stress.
Remember mother nature create them to eat-sleep-poop nothing more nothing less.


If you can rule out physical-then the next step is to try and create it.
By kknowing when it occurs you can find out why it occurs-then you have something to fix.
Can you pinpoint EXACTLY when this happens.
During jumping-rider position change
During lessons-rider position change [we all ride different during lessons]
Not while alone or when in show ring- rider position change [as above we all ride different when people are watching]

With just that litlle bit of info, sounds like a Chiropractic adjustment and/or saddle fit may help him.
Really do your research on a chiro-an unqualified one can do more harm than good.

Helmet every ride right

I can never tell when hes gonna do it. He doesnt pin his ears and when we put jumps up the bucking stops immediatly. He loves to jump. Thanks I'll check to see if we have an qualified Chiropractors around. I dont thinks its his feet though. He bucks alot more in our indoor arena then he does outside but seeing how it's so wet here lately I have no choice but to ride him inside. Thanks again.

I had the vet out the other day. He says hes not sore anywhere and he doesnt think its a pain issue or anything. My trainer says hes done this forever that why the kids camp he was in kicked him out. Im still not sure what to do im going to ride him today. He always loves the colder weather....

As long as your happy with the no pain diagnosis-remember you can always get a second or third opinion.
I've had these ponies before.
Your next step is to become a "Trainer"
You need to go all the way back to the beginning.
Basically start over;
And really pay attention to and pick up on all the little body gestures and different attitudes he shows.
You may be able to groom/tack and mount-but when you get in the ring he starts to feel tense or his ear position changes, his tail wrings/gets tight to body.
Or you may be able to get as far as 30 minutes riding, and ask for counter bend or lead changes-as soon as he changes even the slightest bit- you must immediately go back to something he always does well.

As long as it isn't pain related the longer the timeframe that he stays good the longer that time will continue to increase and eventually the bucking will be gone.
Also- balanced rider position is extremely important, some horses need a really good rider.
That may be him, just could not handle the lack of balance from the up-down lessons and picked up the naughty bucking habit.
Not every horse tolerates beginners.

i brought a horse a few years back that bucked the vet told me there was nothing wrong with her but one winter she clapsed and i had xrays done on her back turns out she has kissing spines very bad now she is a pet kissing spines is very hard to diagnose with out xrays

Ltc pretty much sums up what my post was going to be, Ha...but I will say this,
If it seems pain isn't an issue, and it is a habitual bad-pony habit, have you tried warming him up inside the ring by lunging before you ride him in his lesson? Might help settle him into riding in the ring better. Or have you tried giving him a very effective spank with the crop the second he begins bucking? Maybe try that at any and every instant he starts, until he gets the idea that bucking isn't so pleasant if you get a big whop on the rear every time you start.

Work him very hard, in circles, figure eights when he tries this, and let him rest when he stops, might try that...?

I had a very green palomino QH gelding that would warn you when he wanted to buck. He would generally be at a walk when he started. He would suddenly stop and flick his ears back towards you. Urge him on... he would walk about 5 more steps and abruptly stop again with his ears flicked towards you. After that he would fly into a big crowhopping/bucking spree. The times he did this (about 3-4 times) I would grab up his left rein (he was left-handed, thus way more agile to the left) and pull his nose to my knee and give him a huge whop with the reins on shoulder/butt. This was one of those bad-attitudes, not a pain issue. Didn't take long for him to figure out it wasn't pleasant anymore.

My two cents...

I rode him today and he did alot better. Last year when I started riding him we went through the circles, not letting him stop, lounging. That didnt work. Then I started using my whip and hitting him with it 5 or 6 times hard on the butt. Only doing it one in a row wouldnt have done it because when he bucks he does the 4 or 5 one after the other big bucks. After a few months he seemed to stop bucking, so this other girl started riding him too. Well she breeds "Striaght" Eqyptian arabians and trains the "Parelli" way. Long story short she let him get away with bucking and now we are back to square one. Now he normally has his hissy fit at the begining of the lesson and after several attemps he is fine. So hopefully the whip thing will work again. Im hoping to do pony medals with him this year and maybe we will make it to finals so we can get him sold. ( Im not worried about showing him he never bucks in the show ring and he has only lost one flat class in his life and he got second for it because he picked up the wrong lead). Thanks for all your advice it really helps to have other peoples opinions besides your trainer or your friends.

No problem, I always like getting second opinions also

I'm surprised to hear a parelli student allowing bucking though...hmmm...

Well if more than one spank works, I'd not be against it. It's partly what crops are for anyway, goodluck!