Recently someone asked me to lend him 2 Pokemon:
[you must login to view links]
This is proof that I accepted the trade:
[you must login to view links]
Now, that person claims that he doesn't owe me anything:
[you must login to view links]
I hope this can be sorted. Thanks!

did you send a message or said on Chat that you agree to loaned him pokemon/give him a deadline on when he must paid back?

Well first I made him promise that he would return my stuff, which he agreed:
[you must login to view links]
This is the message I sent shortly after I created the trade described in the previous post:
[you must login to view links]
I did not set a time frame but that doesn't seem to be the case right now since he states that he does not owe me anything.
Thanks!

the thing is we need proof that he said he would returned the pokemon (in value of what you gave him).