ShinyCharyZard
Too old for your rubbish..
So what is Talonflame's achievement?
I won't consider pokemon that faint in 1 hit against Lysandre's Mega Gyarados as ace.
Talonflame was used in 6/8 gyms where it put in a ton of work each time. It defeated it's final form after only just evolving into a Fletchinder. It went up against a Moltres, withstanding it's attacks and evolving in the process. It starred alongside Frogadier against Olympia and defeated Sawyer's Slaking in the league. It withstood a 4x effective Stone Edge from a Mega Gyarados, requiring a further Dragon Tail to knock it out afterwards, making your argument about Mega Gyarados a moot point.
Talonflame was an impressive Pokemon and did more than enough throughout its journey to be considered an ace within the team..