[QUOTE=MacabreMikolaj;566840]The most important things would be for him to be a bombproof childs pony and a pro in the showring, and a lot of people aren't going to believe you can get a 4 year old pony with those traits.
I can believe it. We had a pony in our barn, large, super fancy pony who went to Pony Finals at age 4, he was totally bombproof even when we started him at 3. He was just that kind of pony who is super mature, professional and chill with everything going on around him.
He also didn't need a lot of prep. We worked him on the lunge a lot and he jumped not very often, everytime we did jump him he was such a Pro about it all that he'd lay a perfect trip about everytime, no constant drilling or pounding there.
Though those kinds of ponies are few and far between. Totally not the norm but it can happen.
Gordon Wright once told a student to take up swimming because he would never be a good rider, that rider was George Morris.