Can we still use outdated medals in khux? Like are they still any good if they have good traits and are tier 9 or 10?

I have a lot of tier 7 and below medals and a lot of tier 9 and 10 too. Are old medals still good that have good traits and good for VIP ? How can you tell if they are outdated?

Not sure if the connection to Discord is working (since you got some replies there), but the answer is "yes, you can, but they're really ineffective." The game has a bad problem with moving so fast that many medals that weren't released in the last 6 months are useless (for the most part). The best way to use medals like that and still have them be somewhat effective is to have a copy medal like Reaper or Ansem the Wise copy them, which gives them a higher STR stat and the copy medal's traits. Even then, it's not really recommended to do that since you'd be wasting a slot. While you can still use some of the older medals in Proud mode (for example, a quest that limits you to t9 medals only), many of them are now just there to look pretty.