yellow trinity

I have just beaton the place where you fight Riku twice (forget what it's called) and I relize I have never been to the colleseum. Why? because I seemed to have missed the ability to use yellow trinites. So can someone tell me where to go and what to do to be able to use yellow trinity. I think I must have missed it somewhere early in the game.

Go beat the herc cup to get it.

Well how do you get into the colleseum, like it says it's closed. then that one guy says I need to help clean up. So how do I get into the games?

is that after the cerberus fight?

He is talking about the problem I had too.

Try moving the blco kuntil Sora says it's too heavy. Then talk to Phil again.

Thanx, I really hate that when games do something like that, they assume you'll try to move it when some of us are smart enough to see the trinity and relize it is futile. When yet we need to try to move it to progress thanx for the help.