Was hoping someone would create a thread on Pop-Punk as it has been my favourite genre of music since I was 14-15 and I am one of the few in my friend groups that never 'grew out of it'. I've been listening to it for 15+ years now. I'll name drop some of the best bands I've listened to in this genre in bold so you guys can look them up if you wish!
I started with the likes of Fall Out Boy with their 'Take This to Your Grave' and 'From Under the Cork Tree' albums (still better than anything they've released in the last 10+ years), blink-182, and New Found Glory as these guys were kind of the pioneers for the genre. From there I discovered the likes of Simple Plan, The All-American Rejects, Allister, All Time Low, Alkaline Trio, The Academy Is..., Brand New, Bowling for Soup, Cartel, Farewell, Fenix TX, Hit the Lights, Houston Calls, Jimmy Eat World, Kids in Glass Houses, Mayday Parade, Motion City Soundtrack, MxPx, My Chemical Romance (to a degree), No Use for a Name, Paramore, The Red Jumpsuit Apparatus, The Starting Line, Taking Back Sunday, We the Kings, and YouMeAtSix.
Most of those bands, it was their earlier records that stuck to this kind of genre before 'evolving' into what I'd class as a more mainstream kind of rock. YouMeAtSix being a massive example of that.
In the more recent years I have been listening to more newly formed bands, or at least bands that aren't as old as the majority of the above but are still new to me. State Champs really kicked things off again for me, they are so good and probably my favourite band of the last 7-8 years. From here (thanks to things like Spotify) I have discovered a lot more in this genre such as Broadside, Trash Boat, Neck Deep, WSTR, We Were Sharks, Between You & Me, As It Is, The Story So Far, Knuckle Puck, Post Season, Chin Up Kid, The Wonder Years, and Chunk! No Captain Chunk!
I would suggest anyone interested in the Pop-Punk genre give some of these guys a listen. If you want to know any stand-out tracks (IMO) just holla!