I've been trying to create a trade with another account. I'm not sure if its because the account has over 3000 pokemon but everytime I send a trade to that account it is not added to my Manage Trades page.

The trade I created: [you must login to view links]
Manage Page: [you must login to view links]

I know they didn't delete it because I sent and check manage trades immediately afterwards (less than 5 secs after making) of making a few trades to this account. There's no block setting on the account as far as I'm aware. Also, the other user says he's able to see it.

Is it a one sided trade? IE your side has nothing in it.
If so those do go through they just don't show under manage trades.

May be but i also have trade problems while creatng trade when i selectd a poke and click the trade option and when the result came the poke was not in the list i traded

yeah, if your side does not contain any stuffs, the trade you created will not added in to your manage trades... its so annoying because if we create a one side trade by mistake, we cannot delete that... ppl will think we are annoying! i think this should be fixed!