Only time will tell if Ser Pounce will make an appearance on Game of Thrones anytime soon.
Tommen’s cat was introduced back in Season 4 when Tommen was first starting his reign as king, but Ser Pounce has been mysteriously absent in seasons six.
A more interesting answer is that Ser Pounce actually has an agenda of his own in King’s Landing and has set his plan in motion already.
Tommen already admitted that he had Ser Pounce when he was still Prince Tommen; perhaps Ser Pounce was an accessory to Joffrey’s murder so as to become cat of the king.