Dolphin runs flawlessly on the Deck. Use EmuDeck to install; place the updated ISO in the wii/roms folder. Enable Japanese language via the quick settings menu.
Edward, Leonardo, and Nolan start at lower levels (Lv 1) compared to international versions (Lv 4), and the Japanese version features unique weapons for them (Caladbolg, Lughnasadh, Tarvos) added later in some patches. Skip Functionality: fire emblem akatsuki no megami wii iso jpn updated