Patch your ISO: Use xdelta on your PC to merge the English data with your original Japanese ISO. kamen rider super climax heroes psp iso english patch link

• Finding official releases or stores that sell the game,
• Locating legitimate fan translation projects’ webpages (not the files) or communities to ask about English patches,
• Instructions on how to apply an official patch you already own,

Enable Custom Textures: In Dolphin, go to Graphics > Advanced and check "Load Custom Textures". Finding a complete English patch for the PSP