Need to make sure to advise against piracy, explain why it's not available, and offer alternatives. Maybe mention cloud gaming services if they're applicable, but I don't think Tekken 9 is on any of those platforms.
Also, note that some older Android games might be on third-party sites, but those are risky due to malware. Stress the importance of legal and safe methods. Download Tekken 9 For Android WORK
Looking up current availability, I think Bandai Namco has a game called Tekken Clash on mobile, which is a different title but uses the Tekken IP. The free-to-play model might be what they're looking for. Alternatively, the Steam version of Tekken 9 is available, but that's for PC, not Android. Need to make sure to advise against piracy,
Also, considering the user's intent, they might not be aware of the legal options. It's possible they want to play it on their phone but are frustrated that it's not available. I should suggest alternatives like downloading a free-to-play Tekken mobile game, mentioning that the original might not be available on Android. Stress the importance of legal and safe methods