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, 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.
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.