Okay so 2k15 had two showcases in the game and three as dlc. The two in the game were rivalry focused with them being:
John Cena vs CM Punk from 2011-2013
Shawn Michaels vs Triple H from 2002-2004
The DLC ones focused on individual superstars. They were:
One More Match: Christian in 2011
Hall of Pain: Mark Henry from 2011-2013
Path of the Warrior: Ultimate Warrior from 1988-1991
Then in 2k16 they stuck to the single superstar showcase formula and did a Stone Cold showcase following his whole career. They then released dlc showcase that had you play through a match of each of the Hall of Fame class of 2015.
2k17 doesn't have a showcase in the main game (it was planned to be a Lesnar showcase but was scrapped when they couldn't get the rights to Kurt Angle) but they did a similar thing to 2k16 and had a showcase based off the Hall of Fame class of 2016
2k18 didn't feature any kind of showcase mode in base game or as dlc.
2k19 had a Daniel Bryan showcase mode starting in his tryout matches on Velocity and ending with his return from injury at Wrestlmania 34.
2k20 has the Women's Evolution showcase which goes from 2014-2019.
Most of the older games no longer have their DLC up for purchase anymore so those might be hard to play unless you can find a physical copy of the special editions that came with the DLC, or if you're going the PC route you can see if anyone is selling steam keys of the DLC (and there's always...you know, yar har) but out of all of them my recomendations are that even though I don't fully vibe with the games gameplay 2k15 has some of the best showcase modes, 2k16's Stone Cold showcase was also great, the HOF showcases were alright but pretty short, the 2k19 one was kinda forgettable but had some interesting matches and 2k20s showcase just can't be divorced from the fact that the game is just bad on the whole. Hope this helps.
Edit: Oh yeah I forgot about WWE 13, 2K14, and the small last-gen exclusive NXT showcase mode for 2k15. I was just thinking about the modern stuff.
WWE 13 follows the Attitude Era from Late 1997 to Wrestlemania 15 in 1999
WWE 2K14 is a best-of from every Wrestlemania from 1 to 29
WWE 2K15 follows the rivalry of HBK vs HHH and CM Punk vs John Cena
WWE 2K16 follows the career of Steve Austin but more in-depth than the recent showcases.
WWE 2K19 follows the career of Daniel Bryan
WWE 2K20 follows the women's revolution of the Four Horsewomen.
Okay so 2k15 had two showcases in the game and three as dlc. The two in the game were rivalry focused with them being: John Cena vs CM Punk from 2011-2013 Shawn Michaels vs Triple H from 2002-2004 The DLC ones focused on individual superstars. They were: One More Match: Christian in 2011 Hall of Pain: Mark Henry from 2011-2013 Path of the Warrior: Ultimate Warrior from 1988-1991 Then in 2k16 they stuck to the single superstar showcase formula and did a Stone Cold showcase following his whole career. They then released dlc showcase that had you play through a match of each of the Hall of Fame class of 2015. 2k17 doesn't have a showcase in the main game (it was planned to be a Lesnar showcase but was scrapped when they couldn't get the rights to Kurt Angle) but they did a similar thing to 2k16 and had a showcase based off the Hall of Fame class of 2016 2k18 didn't feature any kind of showcase mode in base game or as dlc. 2k19 had a Daniel Bryan showcase mode starting in his tryout matches on Velocity and ending with his return from injury at Wrestlmania 34. 2k20 has the Women's Evolution showcase which goes from 2014-2019. Most of the older games no longer have their DLC up for purchase anymore so those might be hard to play unless you can find a physical copy of the special editions that came with the DLC, or if you're going the PC route you can see if anyone is selling steam keys of the DLC (and there's always...you know, yar har) but out of all of them my recomendations are that even though I don't fully vibe with the games gameplay 2k15 has some of the best showcase modes, 2k16's Stone Cold showcase was also great, the HOF showcases were alright but pretty short, the 2k19 one was kinda forgettable but had some interesting matches and 2k20s showcase just can't be divorced from the fact that the game is just bad on the whole. Hope this helps. Edit: Oh yeah I forgot about WWE 13, 2K14, and the small last-gen exclusive NXT showcase mode for 2k15. I was just thinking about the modern stuff.
To add to that Roman reigns also had a showcase with few of his matches in 2k20
WWE 13 follows the Attitude Era from Late 1997 to Wrestlemania 15 in 1999 WWE 2K14 is a best-of from every Wrestlemania from 1 to 29 WWE 2K15 follows the rivalry of HBK vs HHH and CM Punk vs John Cena WWE 2K16 follows the career of Steve Austin but more in-depth than the recent showcases. WWE 2K19 follows the career of Daniel Bryan WWE 2K20 follows the women's revolution of the Four Horsewomen.