MIDI: https://www.mediafire.com/file/r7gz305g42ynll5/Battle%2521_World_Champion.mid/file
I have updated the soundfont to include some of the instruments from Pokémon Pinball RS (Labelled PB in the soundfont). Both RSE and Pinball RS use the same soundfont, but there are a few instruments which RSE did not use. Here is the link: https://www.mediafire.com/file/ysbtegcf4tc6uxd/Pokemon_Emerald_Soundfont_%2528Updated_April_20%252C_2021%2529.sf2/file
What I use for the music:
GBAMusRiper (Program used to rip soundbanks from GBA ROMs)
Polyphone (Program used to assemble samples into soundfonts)
Anvil Studio (MIDI composing/sequencing)
SynthFont2 (Software to add soundfonts to MIDI)
Audacity (For fading and loops)