This boss is paid a tribute to Super Mario World: The Secret of the 7 Golden Statues, a SMW hack has made many years ago, which the Boss in the special world is also Jr. Troopa... And the first three dialogue of Jr. Troopa is also coming from the hack. (Special thanks to Mario80. )
In this battle, both Mario and Jr. Troopa have their HP, and Mario can recover his HP by pressing Select Button. (But you must gain some Recover Points first.)
The Recover Points can be collected like score, you can collect them up to 10, and use them to recover your HP, but by doing this your invisible time will be reduced.
Download Link: http://www.mediafire.com/file/7ztcvh4la0j6dhw/Jr.Troopa%27s_Revenge.zip/file
Warning: This boss might be extremely hard, if you are lacking skills in playing SMBX, you'd better not to try it.