This patch swaps all of the English sounds (including cutscenes!) with their Japanese counterparts (since for some reason you can't actually do that in-game in the portable versions).
This patch should be applied to a ROM with CRC-32: 524CFD49
A side effect of this patch is that setting the game's language to Japanese plays the English dub.
This mod needs to be applied with the xdelta patcher, which can be found here: https://www.romhacking.net/utilities/598/
Also, if you're playing on real hardware, I suggest you use this Action Replay code to turn off the mic :
220F2730 00000096
File Name: Puyo Pop Fever (USA) (En,Ja).nds
Country: USA
Serial: NTR-APYE-USA
Original CRC-32: 524CFD49
Original MD5: C2E2B2AC9684A5B29105D8EA24862136
Original SHA1: AF8CECAB1CF6DF7918835BA71C4D31D116D6D1D4
Patched CRC-32: 0088024C
Patched MD5: EBBBA8A6E12641ABA9983471E435F2AB
Patched SHA1: F232B2CBE45B3A7E8EB58F1ABB564076CACB4FEB