0x48ABB0

2 - Electric Grand
13 - Xylophone
46 - Harp
47 - Timpani
48 - Strings
56 - Trumpet
60 - French Horn
73 - Flute
82 - Calliope
83 - Chiff
84 - Charang
85 - Voice
88 - Pad 1 (New Age)
100 - Brightness
101 - Goblin

0x48B078

47 - Timpani
60 - French Horn
80 - Square
81 - Sawtooth
82 - Calliope
83 - Chiff
84 - Charang

0x48B474

01 - Acoustic Grand
4, 5, 6 and 7 - Not Square instruments, but used as Square instruments in GBA Pokemon games.
47 - Timpani
48 - Strings
56 - Trumpet
60 - French Horn
80 - Square
90 - Pad 3 (Polysynth)

0x48B8B8 (Used for the second RSE battle theme)

01 - Bright Acoustic
4, 5, 6 and 7 - Not Square instruments, but used as Square instruments in GBA Pokemon games.
17 - Percussive Organ
33 - Electric Bass (Fingered)
47 - Timpani
48 - Strings
56 - Trumpet
60 - French Horn
81 - Sawtooth
82 - Calliope
83 - Chiff
90 - Pad 3 (Polysynth)

0x48F974

1 - Bright Acoustic
2 - Electric Grand
24 - Acoustic Guitar Nylon
80 - Square
81 - Sawtooth
127 - Gunshot(Used as Drum Noise)

0x48FF74

14 - Tubular Bells
17 - Percussive Organ
24 - Acoustic Guitar Nylon
47 - Timpani
56 - Trumpet
73 - Flute
80 - Square
81 - Sawtooth
87 - Bass + Lead
127 - Gunshot(Used as Drum Noise)

0x490574

17 - Percussive Organ
24 - Acoustic Guitar Nylon
29 - Overdriven Guitar
30 - Distortion Guitar
38 - Synth Bass 1
48 - Strings
56 - Trumpet
78 - Whistle
80 - Square
81 - Sawtooth
83 - Chiff
120 - Guitar Fret Noise
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x490B74

47 - Timpani
48 - Strings
56 - Trumpet
60 - French Horn
80 - Square
81 - Sawtooth
84 - Charang
85 - Voice
87 - Bass + Lead
88 - Pad 1 (New Age)

0x490FAC

21 - Accordian
80 - Square
81 - Sawtooth

0x491390

29 - Overdriven Guitar
30 - Distortion Guitar
38 - Synth Bass 1
62 - SynthBrass 1
80 - Square
81 - Sawtooth
83 - Chiff
84 - Charang
85 - Voice
86 - Lead Fifths
87 - Bass + Lead
88 - Pad 1 (New Age)
89 - Pad 2 (Warm)
125 - Helicopter
127 - Gunshot(Used as Drum Noise)

0x491990

14 - Tubular Bells
47 - Timpani
48 - Strings
56 - Trumpet
58 - Trombone
60 - French Horn
80 - Square
81 - Sawtooth
125 - Helicopter

0x491F90

17 - Percussive Organ
24 - Acoustic Guitar Nylon
48 - Strings
80 - Square
81 - Sawtooth
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x492590

10 - Music Box
17 - Percussive Organ
21 - Accordian
24 - Acoustic Guitar Nylon
48 - Strings
58 - Trombone
78 - Whistle
80 - Square
81 - Sawtooth

0x492B90

02 - Not really a square instrument, but used as such in the game.

0x492BC0

01 - Bright Acoustic
13 - Xylophone
17 - Percussive Organ
21 - Accordian
24 - Acoustic Guitar Nylon
56 - Trumpet
73 - Flute
80 - Square
81 - Sawtooth
83 - Chiff(Used here as Wave)
84 - Charang
85 - Voice(Used here as Wave)

0x4931C0

17 - Percussive Organ
24 - Acoustic Guitar Nylon
38 - Synth Bass 1
80 - Square
81 - Sawtooth
83 - Chiff

0x4935B0

01 - Bright Acoustic
17 - Percussive Organ
24 - Acoustic Guitar Nylon
48 - Strings
80 - Square
81 - Sawtooth
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x493BB0

01 - Bright Acoustic
17 - Percussive Organ
38 - Synth Bass 1
48 - Strings
80 - Square
81 - Sawtooth
126 - Applause(Used as Drum Noise)

0x4941B0

17 - Percussive Organ
24 - Acoustic Guitar Nylon
80 - Square
81 - Sawtooth
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x4947B0
01 - Bright Acoustic
13 - Xylophone
24 - Acoustic Guitar Nylon
48 - Strings
78 - Whistle
80 - Square
81 - Sawtooth
83 - Chiff
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x494DB0

01 - Bright Acoustic
24 - Acoustic Guitar Nylon
48 - Strings
80 - Square
81 - Sawtooth

0x4951A0
13 - Xylophone
39 - Synth Bass 2
48 - Strings
58 - Trombone
80 - Square
81 - Sawtooth
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x4957A0

1 - Bright Acoustic
2 - Used as a Square in GBA Pokemon games
9 - Glockenspiel
13 - Xylophone
46 - Harp
47 - Timpani
48 - Strings
56 - Trumpet
58 - Trombone
60 - French Horn
68 - Oboe
73 - Flute
80 - Square
81 - Sawtooth
82 - Calliope

0x495BFC

78 - Whistle
80 - Square
81 - Sawtooth
83 - Chiff
126 - Applause(Used as Drum Noise)

0x4961FC

47 - Timpani
48 - Strings
56 - Trumpet
80 - Square
81 - Sawtooth
84 - Charang

0x49661C

14 - Tubular Bells
17 - Percussive Organ
24 - Acoustic Guitar Nylon
47 - Timpani
48 - Strings
60 - French Horn
80 - Square
81 - Sawtooth
92 - Pad 5 (Bowed)
127 - Gunshot(Used as Drum Noise)

0x496C1C

14 - Tubular Bells
46 - Harp
47 - Timpani
48 - Strings
56 - Trumpet
60 - French Horn
73 - Flute
81 - Sawtooth
83 - Chiff
127 - Gunshot(Used as Drum Noise)

0x49721C

14 - Tubular Bells
47 - Timpani
48 - Strings
58 - Trombone
60 - French Horn
80 - Square
81 - Sawtooth

0x497678

4 and 5 - Not Squares, but interpreted by the GBA Pokemon games as such.
14 - Tubular Bells
17 - Percussive Organ
24 - Acoustic Guitar Nylon
29 - Overdriven Guitar
30 - Distortion Guitar
47 - Timpani
48 - Strings
60 - French Horn
62 - SynthBrass 1
83 - Chiff
89 - Pad 2 (Warm)
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x497C78

17 - Percussive Organ
21 - Accordian
29 - Overdriven Guitar
30 - Distortion Guitar
33 - Electric Bass (Fingered)
56 - Trumpet
62 - SynthBrass 1
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x498278

17 - Percussive Organ
24 - Acoustic Guitar Nylon
33 - Electric Bass (Fingered)
48 - Strings
80 - Square
81 - Sawtooth
87 - Bass + Lead
92 - Pad 5 (Bowed)
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x498878

4 - Used as synth by the game.
14 - Tubular Bells
24 - Acoustic Guitar Nylon
29 - Overdriven Guitar
30 - Distortion Guitar
31 - Guitar Harmonics
48 - Strings
53 - Voice Oohs
56 - Trumpet
60 - French Horn
62 - SynthBrass 1
80 - Square
81 - Sawtooth
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x498E78

4 - Used as synth.
5 - Used as synth by the game.
24 - Acoustic Guitar Nylon
48 - Strings
80 - Square
81 - Sawtooth
83 - Chiff

0x499478

14 - Tubular Bells
24 - Acoustic Guitar Nylon
48 - Strings
80 - Square
81 - Sawtooth

0x499898

01 - Bright Acoustic
21 - Accordian
48 - Strings
58 - Trombone
73 - Flute
80 - Square
81 - Sawtooth
83 - Chiff
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x499E98
4 - Used as synth
14 - Tubular Bells
17 - Percussive Organ
48 - Strings
80 - Square
81 - Sawtooth

0x49A2F4

01 - Bright Acoustic
05 - Used as synth.
46 - Harp
56 - Trumpet
58 - Trombone
73 - Flute
81 - Sawtooth
92 - Pad 5 (Bowed)
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x49A8F4

04 - Used as synth.
05 - Used as synth.
12 - Marimba(Used as synth here).
24 - Acoustic Guitar Nylon
46 - Harp
48 - Strings
73 - Flute
80 - Square
81 - Sawtooth

0x49AEF4

01 - Bright Acoustic
14 - Tubular Bells
17 - Percussive Organ
24 - Acoustic Guitar Nylon
58 - Trombone
73 - Flute
75 - Pan Flute
78 - Whistle

0x49B4F4

17 - Percussive Organ
24 - Acoustic Guitar Nylon
31 - Guitar Harmonics
48 - Strings
62 - SynthBrass 1
80 - Square
81 - Sawtooth
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x49BAF4

17 - Percussive Organ
21 - Accordian
24 - Acoustic Guitar Nylon
56 - Trumpet
80 - Square
81 - Sawtooth
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x49C0F4

17 - Percussive Organ
24 - Acoustic Guitar Nylon
45 - Pizzicato Strings
48 - Strings
60 - French Horn
73 - Flute
80 - Square
81 - Sawtooth

0x49C6F4

17 - Percussive Organ
75 - Pan Flute
80 - Square
81 - Sawtooth
127 - Gunshot(Used as Drum Noise)

0x49CCF4

47 - Timpani
56 - Trumpet
58 - Trombone
73 - Flute
81 - Sawtooth
82 - Calliope
83 - Chiff

0x49D0E4

45 - Pizzicato Strings
47 - Timpani
48 - Strings
56 - Trumpet
60 - French Horn
73 - Flute
81 - Sawtooth
82 - Calliope
83 - Chiff
85 - Voice
86 - Lead 7 fifths
89 - Pad 2 (Warm)

0x49D528

4 - Electric Piano 1
17 - Percussive Organ
24 - Acoustic Guitar Nylon
48 - Strings
73 - Flute
80 - Square
81 - Sawtooth
92 - Pad 5 (Bowed)
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x49DB28

1 - Bright Acoustic
4 - Electric Piano 1
17 - Percussive Organ
25 - Acoustic Guitar Steel
48 - Strings
80 - Square
81 - Sawtooth
83 - Chiff
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x49E128

1 - Bright Acoustic
30 - Distortion Guitar
38 - Synth Bass 1
80 - Square
81 - Sawtooth
82 - Calliope
83 - Chiff
92 - Pad 5 (Bowed)

0x49E884

13 - Xylophone
24 - Acoustic Guitar Nylon
80 - Square
81 - Sawtooth
87 - Bass + Lead

0x49F16C
13 - Xylophone
24 - Acoustic Guitar Nylon
80 - Square
81 - Sawtooth

0x49F58C

1 - Bright Acoustic
2 - Electric Grand
56 - Trumpet
60 - French Horn
80 - Square
81 - Sawtooth
83 - Chiff

0x4A01E0

47 - Timpani
48 - Strings
56 - Trumpet
58 - Trombone
60 - French Horn
81 - Sawtooth

0x4A0600

24 - Acoustic Guitar Nylon
35 - Fretless Bass
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x4A1008

14 - Tubular Bells
29 - Overdriven Guitar
30 - Distortion Guitar
33 - Electric Bass (Fingered)
48 - Strings
53 - Voice Oohs
60 - French Horn
62 - SynthBrass 1
78 - Whistle
81 - Sawtooth
127 - Gunshot(Used as Drum Noise)

0x4A1C08

01 - Bright Acoustic
24 - Acoustic Guitar Nylon
48 - Strings
56 - Trumpet
60 - French Horn
80 - Square
81 - Sawtooth
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x4A2208

17 - Percussive Organ
24 - Acoustic Guitar Nylon
48 - Strings
80 - Square
81 - Sawtooth
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x4A2808

17 - Percussive Organ
24 - Acoustic Guitar Nylon
48 - Strings
80 - Square
81 - Sawtooth
82 - Calliope
126 - Applause(Used as Drum Noise)
127 - Gunshot(Used as Drum Noise)

0x4A0C00

14 - Tubular Bells
31 - Guitar Harmonics
38 - Synth Bass 1
80 - Square
81 - Sawtooth
85 - Voice(For once, it's actually not used as Synth)

0x4A1608
01 - Bright Acoustic
81 - Sawtooth
127 - Gunshot(Used as Drum Noise)

So yeah, that was the list. Next I'm gonna cover choosing the right voicegroup for your song.

Choosing the Right Voicegroup

When the choosing the voicegroup you want to use, you should generally pick a voicegroup that has a lot of the same instruments that are in your midi. For instance, if your midi uses strings, trumpets, but also guitars, you want to find a voicegroup that has all of those. If you find a voicegroup with most of the same instruments, you can either try your luck or change some of the instruments in that midi, so that they're all in that particular voicegroup. If a particular instrument isn't in any voicegroup, it will probably have to be substituted for some other instrument.

But I'm confused, my tracks have different numbers than the ones used on the GBA...

If you have standard midi software, the track numbers are probably going to be different than what's used on the GBA. I don't know if this'll work for your particular midi program but to get the GBA track number, I take the general midi track number and subtract it by one. So say my general midi program has 57 for the track number of the trumpet, it would be track number 56 in the Pokemon games. Your midi program might also have different names for instruments than mine, but it's generally gonna be in the same order. Hopes this helps you guys gain an understanding.

And yeah, that's the tutorial guys... Hoped it help you out.