First, you would need to have the UC in an account that looks like a main and hopefully that you already use on the boards, start posting little by little on the PC so people get used to seeing you. After a while, put the UC as active so people can look at it when you post... hopefully is not a super high-end UC? If it is, then you would need to wait more time and it can be tricky anyway since PCers get suspicious of new high-end UCs that appear.
Then, start offering the pet on UC Trading boards or by neomail, not making a board exclusively to advertise the pet. After a while if you haven't found a trade offering the pet by neomail, and when you feel enough people know it's UFT, then you can make a board. In that case if someone is like 'What? I've never seen that UC UFT' others will be like 'nah, it's been UFT for a while, they offered it to me a month ago, so it's all good'.
Also, don't offer the UC to the PCers that have like... 10+UCs UFT or that own many high-end UCs, those usually know already all the pool of UCs in the PC and usually get suspicious quickly or even feel they have the right to ask you how you got such UC (has happened to me with lilangel for example LMAO).
Though, you wanna be 100% safe and avoid freezing? Trade in cK then![]()