About This File
A rudimentary viewer and editor program for GP1 files.
Supports drag and drop (just drag the GP1 onto the program).
Has a function to store location data, as well as use stored location data.
The bundled location.txt needs to be in the same folder as the program, for it to work.
Also has in-built CP calculator, based on IVs and level.
Note: the CP shown, is based on PGo CP calculation, which is how Go Park works.
Initial encounter, it will show PGo details. Once captured, the CP gets rerolled to Let's Go CP.
If you're rehosting it, please link/source THIS page. 
Source Code: https://github.com/PP-theSLAYER/gp1editor
(I gotta warn you, it's horrible code)
Note from 13th December, 2018:
On this day, some of the stats of certain Pokemon has been changed.
If I'm not mistaken, unlike the forced stat change enforced during Let's Go's release, these only kick in if:
(1) you evolved into that Pokemon after the change or
(2) you powered up the particular species after the change or
(3) you freshly captured that species after the change or
(4) you received the Pokemon from trade after the change.
Meaning if you already had the creature before the change, it's CP and stats will remain unchanged on Pokemon Go, until you performed one of the points above.
Do note that these changes could be enforced in the future, even if the actions specified above wasn't performed.
[Confirmed on my end; I transferred 2 Meltan on 13-Dec, one captured before and one captured after the change.
The older one uses old CP calculation, while newer one uses new calculation. See image in screenshots section]
In any case, these are the Pokemon affected by the change:
Credits to @Kelven91 on twitter
What's New in Version 1.0.12 See changelog
Released
Version 1.0.12
Base Program
Fixed: Handling of the HP value transferred from GO (for any new HP values written)
Location List
No Changes.
Version 1.0.11
Base Program
Added: Handling of the HP value transferred from GO
Added: Moves - Flying Press, Aura Sphere, Payback, Rock Wrecker
Location List
No Changes.
Version 1.0.10
Base Program
Added: Moves - Thunder Fang, Ice Fang, Horn Drill, Fissure, Secret Sword
Location List
No Changes.
Version 1.0.9
Base Program
Added: Moves - Lock On
Location List
No Changes.
Version 1.0.8
Base Program
Added: Moves - Charm, Giga Impact, Frustration, Return, Synchronoise
Hotfixed: Minor issue with location name importing
Location List
Added: Sanriku Iwate Japan (oddly parsed as , , Japan on PGO), Chicago US, Sao Paulo Brazil (oddly parsed as São Paulo, SP, Brazil)
Version 1.0.7
Changed: Added Power-Up Punch to the list
Added: Description text that specifies if the move is Fast, Charged or Unused. (some moves that are presently unused aren't listed as such, such as Origin Pulse/Precipice Blades)
Changed: Added Index number before move name
No changes made to the Location List.
Version 1.0.6
Added: Creates a location.txt in directory, with some pre-populated locations, if the file is missing from the directory.
No changes made to the Location List.
Version 1.0.5
Added: Second CP calculator box that accounts for the new changes added on 13th December, 2018.
Updated: Added the remainder of the moves. (Unused handling up to move slot 415)
No changes made to the Location List.
Version 1.0.4
Updated: Fixed unknown moves based on PogoAssets
No changes made to the Location List.
Version 1.0.3
Added: Basic CP Calculator mode for the other species, as well as basic Mega/Primal support for CP Calculator mode.
No changes made to the Location List.
Version 1.0.2
Added: Button for Min IVs and Max IVs
Changed: Draco Meteor's ID is known, so added to move list.
Changed: Changing Species, changing Alolan Flag or changing IVs will immediately recalculate CP.
No changes made to the Location List.
Version 1.0.1
Added: Tottori and Dortmund to location list.
No changes to base program.
